Clarify compilation target in package documentation

Updated documentation to clarify that the compilation targets LLVM IR instead of eBPF bytecode directly.

.gitignore

@@ -8,5 +8,3 @@ __pycache__/
 *.o
 .ipynb_checkpoints/
 vmlinux.py
-~*
-vmlinux.h

.pre-commit-config.yaml

@@ -12,7 +12,7 @@
 #
 # See https://github.com/pre-commit/pre-commit
 
-exclude: 'vmlinux.py'
+exclude: 'vmlinux.*\.py$'
 
 ci:
   autoupdate_commit_msg: "chore: update pre-commit hooks"
@@ -41,7 +41,7 @@ repos:
     - id: ruff
       args: ["--fix", "--show-fixes"]
     - id: ruff-format
-#      exclude: ^(docs)|^(tests)|^(examples)
+      exclude: ^(docs)|^(tests)|^(examples)
 
 # Checking static types
 - repo: https://github.com/pre-commit/mirrors-mypy

README.md

@@ -83,14 +83,14 @@ def hist() -> HashMap:
 def hello(ctx: c_void_p) -> c_int64:
     process_id = pid()
     one = 1
-    prev = hist.lookup(process_id)
+    prev = hist().lookup(process_id)
     if prev:
         previous_value = prev + 1
         print(f"count: {previous_value} with {process_id}")
-        hist.update(process_id, previous_value)
+        hist().update(process_id, previous_value)
         return c_int64(0)
     else:
-        hist.update(process_id, one)
+        hist().update(process_id, one)
     return c_int64(0)
 
 

examples/clone-matplotlib.ipynb

@@ -308,7 +308,6 @@
     "def hist() -> HashMap:\n",
     "    return HashMap(key=c_int32, value=c_uint64, max_entries=4096)\n",
     "\n",
-    "\n",
     "@bpf\n",
     "@section(\"tracepoint/syscalls/sys_enter_clone\")\n",
     "def hello(ctx: c_void_p) -> c_int64:\n",
@@ -330,7 +329,6 @@
     "def LICENSE() -> str:\n",
     "    return \"GPL\"\n",
     "\n",
-    "\n",
     "b = BPF()"
    ]
   },
@@ -359,6 +357,7 @@
     }
    ],
    "source": [
+    "\n",
     "b.load_and_attach()\n",
     "hist = BpfMap(b, hist)\n",
     "print(\"Recording\")\n",

examples/kprobes.py

@@ -8,14 +8,12 @@ def hello_world(ctx: c_void_p) -> c_int64:
     print("Hello, World!")
     return c_int64(0)
 
-
 @bpf
 @section("kprobe/do_unlinkat")
 def hello_world2(ctx: c_void_p) -> c_int64:
     print("Hello, World!")
     return c_int64(0)
 
-
 @bpf
 @bpfglobal
 def LICENSE() -> str:

examples/struct_and_perf.py

@@ -27,7 +27,7 @@ def hello(ctx: c_void_p) -> c_int32:
     dataobj.pid = pid()
     dataobj.ts = ktime()
     # dataobj.comm = strobj
-    print(f"clone called at {dataobj.ts} by pid{dataobj.pid}, comm {strobj}")
+    print(f"clone called at {dataobj.ts} by pid" f"{dataobj.pid}, comm {strobj}")
     events.output(dataobj)
     return c_int32(0)
 

examples/xdp_pass.py

@@ -1,8 +1,8 @@
-from pythonbpf import bpf, map, section, bpfglobal, compile, compile_to_ir
+from pythonbpf import bpf, map, section, bpfglobal, compile
 from pythonbpf.helper import XDP_PASS
 from pythonbpf.maps import HashMap
-from ctypes import c_int64, c_void_p
 
+from ctypes import c_void_p, c_int64
 
 # Instructions to how to run this program
 # 1. Install PythonBPF: pip install pythonbpf
@@ -41,5 +41,4 @@ def LICENSE() -> str:
     return "GPL"
 
 
-compile_to_ir("xdp_pass.py", "xdp_pass.ll")
 compile()

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pythonbpf"
-version = "0.1.5"
+version = "0.1.4"
 description = "Reduced Python frontend for eBPF"
 authors = [
   { name = "r41k0u", email="pragyanshchaturvedi18@gmail.com" },

pythonbpf/__init__.py

@@ -1,3 +1,10 @@
+"""
+PythonBPF - A Python frontend for eBPF programs.
+
+This package provides decorators and compilation tools to write BPF programs
+in Python syntax and compile them to LLVM IR that can be compiled to eBPF bytecode.
+"""
+
 from .decorators import bpf, map, section, bpfglobal, struct
 from .codegen import compile_to_ir, compile, BPF
 

pythonbpf/allocation_pass.py

@@ -1,178 +0,0 @@
-import ast
-import logging
-
-from llvmlite import ir
-from dataclasses import dataclass
-from typing import Any
-from pythonbpf.helper import HelperHandlerRegistry
-from pythonbpf.type_deducer import ctypes_to_ir
-
-logger = logging.getLogger(__name__)
-
-
-@dataclass
-class LocalSymbol:
-    var: ir.AllocaInstr
-    ir_type: ir.Type
-    metadata: Any = None
-
-    def __iter__(self):
-        yield self.var
-        yield self.ir_type
-        yield self.metadata
-
-
-def handle_assign_allocation(builder, stmt, local_sym_tab, structs_sym_tab):
-    """Handle memory allocation for assignment statements."""
-
-    # Validate assignment
-    if len(stmt.targets) != 1:
-        logger.warning("Multi-target assignment not supported, skipping allocation")
-        return
-
-    target = stmt.targets[0]
-
-    # Skip non-name targets (e.g., struct field assignments)
-    if isinstance(target, ast.Attribute):
-        logger.debug(f"Struct field assignment to {target.attr}, no allocation needed")
-        return
-
-    if not isinstance(target, ast.Name):
-        logger.warning(f"Unsupported assignment target type: {type(target).__name__}")
-        return
-
-    var_name = target.id
-    rval = stmt.value
-
-    # Skip if already allocated
-    if var_name in local_sym_tab:
-        logger.debug(f"Variable {var_name} already allocated, skipping")
-        return
-
-    # Determine type and allocate based on rval
-    if isinstance(rval, ast.Call):
-        _allocate_for_call(builder, var_name, rval, local_sym_tab, structs_sym_tab)
-    elif isinstance(rval, ast.Constant):
-        _allocate_for_constant(builder, var_name, rval, local_sym_tab)
-    elif isinstance(rval, ast.BinOp):
-        _allocate_for_binop(builder, var_name, local_sym_tab)
-    else:
-        logger.warning(
-            f"Unsupported assignment value type for {var_name}: {type(rval).__name__}"
-        )
-
-
-def _allocate_for_call(builder, var_name, rval, local_sym_tab, structs_sym_tab):
-    """Allocate memory for variable assigned from a call."""
-
-    if isinstance(rval.func, ast.Name):
-        call_type = rval.func.id
-
-        # C type constructors
-        if call_type in ("c_int32", "c_int64", "c_uint32", "c_uint64"):
-            ir_type = ctypes_to_ir(call_type)
-            var = builder.alloca(ir_type, name=var_name)
-            var.align = ir_type.width // 8
-            local_sym_tab[var_name] = LocalSymbol(var, ir_type)
-            logger.info(f"Pre-allocated {var_name} as {call_type}")
-
-        # Helper functions
-        elif HelperHandlerRegistry.has_handler(call_type):
-            ir_type = ir.IntType(64)  # Assume i64 return type
-            var = builder.alloca(ir_type, name=var_name)
-            var.align = 8
-            local_sym_tab[var_name] = LocalSymbol(var, ir_type)
-            logger.info(f"Pre-allocated {var_name} for helper {call_type}")
-
-        # Deref function
-        elif call_type == "deref":
-            ir_type = ir.IntType(64)  # Assume i64 return type
-            var = builder.alloca(ir_type, name=var_name)
-            var.align = 8
-            local_sym_tab[var_name] = LocalSymbol(var, ir_type)
-            logger.info(f"Pre-allocated {var_name} for deref")
-
-        # Struct constructors
-        elif call_type in structs_sym_tab:
-            struct_info = structs_sym_tab[call_type]
-            var = builder.alloca(struct_info.ir_type, name=var_name)
-            local_sym_tab[var_name] = LocalSymbol(var, struct_info.ir_type, call_type)
-            logger.info(f"Pre-allocated {var_name} for struct {call_type}")
-
-        else:
-            logger.warning(f"Unknown call type for allocation: {call_type}")
-
-    elif isinstance(rval.func, ast.Attribute):
-        # Map method calls - need double allocation for ptr handling
-        _allocate_for_map_method(builder, var_name, local_sym_tab)
-
-    else:
-        logger.warning(f"Unsupported call function type for {var_name}")
-
-
-def _allocate_for_map_method(builder, var_name, local_sym_tab):
-    """Allocate memory for variable assigned from map method (double alloc)."""
-
-    # Main variable (pointer to pointer)
-    ir_type = ir.PointerType(ir.IntType(64))
-    var = builder.alloca(ir_type, name=var_name)
-    local_sym_tab[var_name] = LocalSymbol(var, ir_type)
-
-    # Temporary variable for computed values
-    tmp_ir_type = ir.IntType(64)
-    var_tmp = builder.alloca(tmp_ir_type, name=f"{var_name}_tmp")
-    local_sym_tab[f"{var_name}_tmp"] = LocalSymbol(var_tmp, tmp_ir_type)
-
-    logger.info(f"Pre-allocated {var_name} and {var_name}_tmp for map method")
-
-
-def _allocate_for_constant(builder, var_name, rval, local_sym_tab):
-    """Allocate memory for variable assigned from a constant."""
-
-    if isinstance(rval.value, bool):
-        ir_type = ir.IntType(1)
-        var = builder.alloca(ir_type, name=var_name)
-        var.align = 1
-        local_sym_tab[var_name] = LocalSymbol(var, ir_type)
-        logger.info(f"Pre-allocated {var_name} as bool")
-
-    elif isinstance(rval.value, int):
-        ir_type = ir.IntType(64)
-        var = builder.alloca(ir_type, name=var_name)
-        var.align = 8
-        local_sym_tab[var_name] = LocalSymbol(var, ir_type)
-        logger.info(f"Pre-allocated {var_name} as i64")
-
-    elif isinstance(rval.value, str):
-        ir_type = ir.PointerType(ir.IntType(8))
-        var = builder.alloca(ir_type, name=var_name)
-        var.align = 8
-        local_sym_tab[var_name] = LocalSymbol(var, ir_type)
-        logger.info(f"Pre-allocated {var_name} as string")
-
-    else:
-        logger.warning(
-            f"Unsupported constant type for {var_name}: {type(rval.value).__name__}"
-        )
-
-
-def _allocate_for_binop(builder, var_name, local_sym_tab):
-    """Allocate memory for variable assigned from a binary operation."""
-    ir_type = ir.IntType(64)  # Assume i64 result
-    var = builder.alloca(ir_type, name=var_name)
-    var.align = 8
-    local_sym_tab[var_name] = LocalSymbol(var, ir_type)
-    logger.info(f"Pre-allocated {var_name} for binop result")
-
-
-def allocate_temp_pool(builder, max_temps, local_sym_tab):
-    """Allocate the temporary scratch space pool for helper arguments."""
-    if max_temps == 0:
-        return
-
-    logger.info(f"Allocating temp pool of {max_temps} variables")
-    for i in range(max_temps):
-        temp_name = f"__helper_temp_{i}"
-        temp_var = builder.alloca(ir.IntType(64), name=temp_name)
-        temp_var.align = 8
-        local_sym_tab[temp_name] = LocalSymbol(temp_var, ir.IntType(64))

pythonbpf/assign_pass.py

@@ -1,108 +0,0 @@
-import ast
-import logging
-from llvmlite import ir
-from pythonbpf.expr import eval_expr
-
-logger = logging.getLogger(__name__)
-
-
-def handle_struct_field_assignment(
-    func, module, builder, target, rval, local_sym_tab, map_sym_tab, structs_sym_tab
-):
-    """Handle struct field assignment (obj.field = value)."""
-
-    var_name = target.value.id
-    field_name = target.attr
-
-    if var_name not in local_sym_tab:
-        logger.error(f"Variable '{var_name}' not found in symbol table")
-        return
-
-    struct_type = local_sym_tab[var_name].metadata
-    struct_info = structs_sym_tab[struct_type]
-
-    if field_name not in struct_info.fields:
-        logger.error(f"Field '{field_name}' not found in struct '{struct_type}'")
-        return
-
-    # Get field pointer and evaluate value
-    field_ptr = struct_info.gep(builder, local_sym_tab[var_name].var, field_name)
-    val = eval_expr(
-        func, module, builder, rval, local_sym_tab, map_sym_tab, structs_sym_tab
-    )
-
-    if val is None:
-        logger.error(f"Failed to evaluate value for {var_name}.{field_name}")
-        return
-
-    # TODO: Handle string assignment to char array (not a priority)
-    field_type = struct_info.field_type(field_name)
-    if isinstance(field_type, ir.ArrayType) and val[1] == ir.PointerType(ir.IntType(8)):
-        logger.warning(
-            f"String to char array assignment not implemented for {var_name}.{field_name}"
-        )
-        return
-
-    # Store the value
-    builder.store(val[0], field_ptr)
-    logger.info(f"Assigned to struct field {var_name}.{field_name}")
-
-
-def handle_variable_assignment(
-    func, module, builder, var_name, rval, local_sym_tab, map_sym_tab, structs_sym_tab
-):
-    """Handle single named variable assignment."""
-
-    if var_name not in local_sym_tab:
-        logger.error(f"Variable {var_name} not declared.")
-        return False
-
-    var_ptr = local_sym_tab[var_name].var
-    var_type = local_sym_tab[var_name].ir_type
-
-    # NOTE: Special case for struct initialization
-    if isinstance(rval, ast.Call) and isinstance(rval.func, ast.Name):
-        struct_name = rval.func.id
-        if struct_name in structs_sym_tab and len(rval.args) == 0:
-            struct_info = structs_sym_tab[struct_name]
-            ir_struct = struct_info.ir_type
-
-            builder.store(ir.Constant(ir_struct, None), var_ptr)
-            logger.info(f"Initialized struct {struct_name} for variable {var_name}")
-            return True
-
-    val_result = eval_expr(
-        func, module, builder, rval, local_sym_tab, map_sym_tab, structs_sym_tab
-    )
-    if val_result is None:
-        logger.error(f"Failed to evaluate value for {var_name}")
-        return False
-
-    val, val_type = val_result
-    logger.info(f"Evaluated value for {var_name}: {val} of type {val_type}, {var_type}")
-    if val_type != var_type:
-        if isinstance(val_type, ir.IntType) and isinstance(var_type, ir.IntType):
-            # Allow implicit int widening
-            if val_type.width < var_type.width:
-                val = builder.sext(val, var_type)
-                logger.info(f"Implicitly widened int for variable {var_name}")
-            elif val_type.width > var_type.width:
-                val = builder.trunc(val, var_type)
-                logger.info(f"Implicitly truncated int for variable {var_name}")
-        elif isinstance(val_type, ir.IntType) and isinstance(var_type, ir.PointerType):
-            # NOTE: This is assignment to a PTR_TO_MAP_VALUE_OR_NULL
-            logger.info(
-                f"Creating temporary variable for pointer assignment to {var_name}"
-            )
-            var_ptr_tmp = local_sym_tab[f"{var_name}_tmp"].var
-            builder.store(val, var_ptr_tmp)
-            val = var_ptr_tmp
-        else:
-            logger.error(
-                f"Type mismatch for variable {var_name}: {val_type} vs {var_type}"
-            )
-            return False
-
-    builder.store(val, var_ptr)
-    logger.info(f"Assigned value to variable {var_name}")
-    return True

pythonbpf/binary_ops.py

@@ -0,0 +1,102 @@
+"""
+Binary operations handling for BPF programs.
+
+This module provides functions to handle binary operations (add, subtract,
+multiply, etc.) and emit the corresponding LLVM IR instructions.
+"""
+
+import ast
+from llvmlite import ir
+from logging import Logger
+import logging
+
+logger: Logger = logging.getLogger(__name__)
+
+
+def recursive_dereferencer(var, builder):
+    """dereference until primitive type comes out"""
+    # TODO: Not worrying about stack overflow for now
+    logger.info(f"Dereferencing {var}, type is {var.type}")
+    if isinstance(var.type, ir.PointerType):
+        a = builder.load(var)
+        return recursive_dereferencer(a, builder)
+    elif isinstance(var.type, ir.IntType):
+        return var
+    else:
+        raise TypeError(f"Unsupported type for dereferencing: {var.type}")
+
+
+def get_operand_value(operand, builder, local_sym_tab):
+    """Extract the value from an operand, handling variables and constants."""
+    if isinstance(operand, ast.Name):
+        if operand.id in local_sym_tab:
+            return recursive_dereferencer(local_sym_tab[operand.id].var, builder)
+        raise ValueError(f"Undefined variable: {operand.id}")
+    elif isinstance(operand, ast.Constant):
+        if isinstance(operand.value, int):
+            return ir.Constant(ir.IntType(64), operand.value)
+        raise TypeError(f"Unsupported constant type: {type(operand.value)}")
+    elif isinstance(operand, ast.BinOp):
+        return handle_binary_op_impl(operand, builder, local_sym_tab)
+    raise TypeError(f"Unsupported operand type: {type(operand)}")
+
+
+def handle_binary_op_impl(rval, builder, local_sym_tab):
+    """
+    Handle binary operations and emit corresponding LLVM IR instructions.
+
+    Args:
+        rval: The AST BinOp node representing the binary operation
+        builder: LLVM IR builder for emitting instructions
+        local_sym_tab: Symbol table mapping variable names to their IR representations
+
+    Returns:
+        The LLVM IR value representing the result of the binary operation
+    """
+    op = rval.op
+    left = get_operand_value(rval.left, builder, local_sym_tab)
+    right = get_operand_value(rval.right, builder, local_sym_tab)
+    logger.info(f"left is {left}, right is {right}, op is {op}")
+
+    # Map AST operation nodes to LLVM IR builder methods
+    op_map = {
+        ast.Add: builder.add,
+        ast.Sub: builder.sub,
+        ast.Mult: builder.mul,
+        ast.Div: builder.sdiv,
+        ast.Mod: builder.srem,
+        ast.LShift: builder.shl,
+        ast.RShift: builder.lshr,
+        ast.BitOr: builder.or_,
+        ast.BitXor: builder.xor,
+        ast.BitAnd: builder.and_,
+        ast.FloorDiv: builder.udiv,
+    }
+
+    if type(op) in op_map:
+        result = op_map[type(op)](left, right)
+        return result
+    else:
+        raise SyntaxError("Unsupported binary operation")
+
+
+def handle_binary_op(rval, builder, var_name, local_sym_tab):
+    """
+    Handle binary operations and optionally store the result to a variable.
+
+    Args:
+        rval: The AST BinOp node representing the binary operation
+        builder: LLVM IR builder for emitting instructions
+        var_name: Optional variable name to store the result
+        local_sym_tab: Symbol table mapping variable names to their IR representations
+
+    Returns:
+        A tuple of (result_value, result_type)
+    """
+    result = handle_binary_op_impl(rval, builder, local_sym_tab)
+    if var_name and var_name in local_sym_tab:
+        logger.info(
+            f"Storing result {result} into variable {local_sym_tab[var_name].var}"
+        )
+        builder.store(result, local_sym_tab[var_name].var)
+    return result, result.type

pythonbpf/codegen.py

@@ -1,10 +1,17 @@
+"""
+Code generation module for PythonBPF.
+
+This module handles the conversion of Python BPF programs to LLVM IR and
+object files. It provides the main compilation pipeline from Python AST
+to BPF bytecode.
+"""
+
 import ast
 from llvmlite import ir
 from .license_pass import license_processing
 from .functions import func_proc
 from .maps import maps_proc
 from .structs import structs_proc
-from .vmlinux_parser import vmlinux_proc
 from .globals_pass import (
     globals_list_creation,
     globals_processing,
@@ -19,20 +26,10 @@ from pylibbpf import BpfProgram
 import tempfile
 from logging import Logger
 import logging
-import re
 
 logger: Logger = logging.getLogger(__name__)
 
-VERSION = "v0.1.5"
-
-
-def finalize_module(original_str):
-    """After all IR generation is complete, we monkey patch btf_ama attribute"""
-
-    # Create a string with applied transformation of btf_ama attribute addition to BTF struct field accesses.
-    pattern = r'(@"llvm\.[^"]+:[^"]*" = external global i64, !llvm\.preserve\.access\.index ![0-9]+)'
-    replacement = r'\1 "btf_ama"'
-    return re.sub(pattern, replacement, original_str)
+VERSION = "v0.1.4"
 
 
 def find_bpf_chunks(tree):
@@ -48,6 +45,14 @@ def find_bpf_chunks(tree):
 
 
 def processor(source_code, filename, module):
+    """
+    Process Python source code and convert BPF-decorated functions to LLVM IR.
+
+    Args:
+        source_code: The Python source code to process
+        filename: The name of the source file
+        module: The LLVM IR module to populate
+    """
     tree = ast.parse(source_code, filename)
     logger.debug(ast.dump(tree, indent=4))
 
@@ -55,7 +60,6 @@ def processor(source_code, filename, module):
     for func_node in bpf_chunks:
         logger.info(f"Found BPF function/struct: {func_node.name}")
 
-    vmlinux_proc(tree, module)
     populate_global_symbol_table(tree, module)
     license_processing(tree, module)
     globals_processing(tree, module)
@@ -68,6 +72,17 @@ def processor(source_code, filename, module):
 
 
 def compile_to_ir(filename: str, output: str, loglevel=logging.INFO):
+    """
+    Compile a Python BPF program to LLVM IR.
+
+    Args:
+        filename: Path to the Python source file containing BPF programs
+        output: Path where the LLVM IR (.ll) file will be written
+        loglevel: Logging level for compilation messages
+
+    Returns:
+        Path to the generated LLVM IR file
+    """
     logging.basicConfig(
         level=loglevel, format="%(asctime)s [%(levelname)s] %(name)s: %(message)s"
     )
@@ -131,45 +146,28 @@ def compile_to_ir(filename: str, output: str, loglevel=logging.INFO):
 
     module.add_named_metadata("llvm.ident", [f"PythonBPF {VERSION}"])
 
-    module_string = finalize_module(str(module))
-
     logger.info(f"IR written to {output}")
     with open(output, "w") as f:
         f.write(f'source_filename = "{filename}"\n')
-        f.write(module_string)
+        f.write(str(module))
         f.write("\n")
 
     return output
 
 
-def _run_llc(ll_file, obj_file):
-    """Compile LLVM IR to BPF object file using llc."""
-
-    logger.info(f"Compiling IR to object: {ll_file} -> {obj_file}")
-    result = subprocess.run(
-        [
-            "llc",
-            "-march=bpf",
-            "-filetype=obj",
-            "-O2",
-            str(ll_file),
-            "-o",
-            str(obj_file),
-        ],
-        check=True,
-        capture_output=True,
-        text=True,
-    )
-
-    if result.returncode == 0:
-        logger.info(f"Object file written to {obj_file}")
-        return True
-    else:
-        logger.error(f"llc compilation failed: {result.stderr}")
-        return False
-
-
 def compile(loglevel=logging.INFO) -> bool:
+    """
+    Compile the calling Python BPF program to an object file.
+
+    This function should be called from a Python file containing BPF programs.
+    It will compile the calling file to LLVM IR and then to a BPF object file.
+
+    Args:
+        loglevel: Logging level for compilation messages
+
+    Returns:
+        True if compilation succeeded, False otherwise
+    """
     # Look one level up the stack to the caller of this function
     caller_frame = inspect.stack()[1]
     caller_file = Path(caller_frame.filename).resolve()
@@ -182,13 +180,39 @@ def compile(loglevel=logging.INFO) -> bool:
         compile_to_ir(str(caller_file), str(ll_file), loglevel=loglevel) and success
     )
 
-    success = _run_llc(ll_file, o_file) and success
+    success = bool(
+        subprocess.run(
+            [
+                "llc",
+                "-march=bpf",
+                "-filetype=obj",
+                "-O2",
+                str(ll_file),
+                "-o",
+                str(o_file),
+            ],
+            check=True,
+        )
+        and success
+    )
 
     logger.info(f"Object written to {o_file}")
     return success
 
 
 def BPF(loglevel=logging.INFO) -> BpfProgram:
+    """
+    Compile the calling Python BPF program and return a BpfProgram object.
+
+    This function compiles the calling file's BPF programs to an object file
+    and loads it into a BpfProgram object for immediate use.
+
+    Args:
+        loglevel: Logging level for compilation messages
+
+    Returns:
+        A BpfProgram object that can be used to load and attach BPF programs
+    """
     caller_frame = inspect.stack()[1]
     src = inspect.getsource(caller_frame.frame)
     with tempfile.NamedTemporaryFile(
@@ -202,6 +226,17 @@ def BPF(loglevel=logging.INFO) -> BpfProgram:
         f.flush()
         source = f.name
         compile_to_ir(source, str(inter.name), loglevel=loglevel)
-        _run_llc(str(inter.name), str(obj_file.name))
+        subprocess.run(
+            [
+                "llc",
+                "-march=bpf",
+                "-filetype=obj",
+                "-O2",
+                str(inter.name),
+                "-o",
+                str(obj_file.name),
+            ],
+            check=True,
+        )
 
         return BpfProgram(str(obj_file.name))

pythonbpf/debuginfo/__init__.py

@@ -1,3 +1,5 @@
+"""Debug information generation for BPF programs (DWARF/BTF)."""
+
 from .dwarf_constants import *  # noqa: F403
 from .dtypes import *  # noqa: F403
 from .debug_info_generator import DebugInfoGenerator

pythonbpf/debuginfo/debug_info_generator.py

@@ -8,11 +8,31 @@ from typing import Any, List
 
 
 class DebugInfoGenerator:
+    """
+    Generator for DWARF/BTF debug information in LLVM IR modules.
+
+    This class provides methods to create debug metadata for BPF programs,
+    including types, structs, globals, and compilation units.
+    """
+
     def __init__(self, module):
+        """
+        Initialize the debug info generator.
+
+        Args:
+            module: LLVM IR module to attach debug info to
+        """
         self.module = module
         self._type_cache = {}  # Cache for common debug types
 
     def generate_file_metadata(self, filename, dirname):
+        """
+        Generate file metadata for debug info.
+
+        Args:
+            filename: Name of the source file
+            dirname: Directory containing the source file
+        """
         self.module._file_metadata = self.module.add_debug_info(
             "DIFile",
             {  # type: ignore
@@ -24,6 +44,15 @@ class DebugInfoGenerator:
     def generate_debug_cu(
         self, language, producer: str, is_optimized: bool, is_distinct: bool
     ):
+        """
+        Generate debug compile unit metadata.
+
+        Args:
+            language: DWARF language code (e.g., DW_LANG_C11)
+            producer: Compiler/producer string
+            is_optimized: Whether the code is optimized
+            is_distinct: Whether the compile unit should be distinct
+        """
         self.module._debug_compile_unit = self.module.add_debug_info(
             "DICompileUnit",
             {  # type: ignore
@@ -83,6 +112,16 @@ class DebugInfoGenerator:
 
     @staticmethod
     def _compute_array_size(base_type: Any, count: int) -> int:
+        """
+        Compute the size of an array in bits.
+
+        Args:
+            base_type: The base type of the array
+            count: Number of elements in the array
+
+        Returns:
+            Total size in bits
+        """
         # Extract size from base_type if possible
         # For simplicity, assuming base_type has a size attribute
         return getattr(base_type, "size", 32) * count

pythonbpf/debuginfo/dtypes.py

@@ -1,7 +1,11 @@
+"""Debug information types and constants."""
+
 import llvmlite.ir as ir
 
 
 class DwarfBehaviorEnum:
+    """DWARF module flag behavior constants for LLVM."""
+
     ERROR_IF_MISMATCH = ir.Constant(ir.IntType(32), 1)
     WARNING_IF_MISMATCH = ir.Constant(ir.IntType(32), 2)
     OVERRIDE_USE_LARGEST = ir.Constant(ir.IntType(32), 7)

pythonbpf/debuginfo/dwarf_constants.py

@@ -1,3 +1,9 @@
+"""
+DWARF debugging format constants.
+
+Generated constants from dwarf.h for use in debug information generation.
+"""
+
 # generated constants from dwarf.h
 
 DW_UT_compile = 0x01

pythonbpf/decorators.py

@@ -1,3 +1,11 @@
+"""
+Decorators for marking BPF functions, maps, structs, and globals.
+
+This module provides the core decorators used to annotate Python code
+for BPF compilation.
+"""
+
+
 def bpf(func):
     """Decorator to mark a function for BPF compilation."""
     func._is_bpf = True
@@ -23,7 +31,18 @@ def struct(cls):
 
 
 def section(name: str):
+    """
+    Decorator to specify the ELF section name for a BPF program.
+
+    Args:
+        name: The section name (e.g., 'xdp', 'tracepoint/syscalls/sys_enter_execve')
+
+    Returns:
+        A decorator function that marks the function with the section name
+    """
+
     def wrapper(fn):
+        """Decorator that sets the section name on the function."""
         fn._section = name
         return fn
 

pythonbpf/expr/__init__.py

@@ -1,14 +1,6 @@
-from .expr_pass import eval_expr, handle_expr, get_operand_value
-from .type_normalization import convert_to_bool, get_base_type_and_depth
-from .ir_ops import deref_to_depth
-from .call_registry import CallHandlerRegistry
+"""Expression evaluation and processing for BPF programs."""
 
-__all__ = [
-    "eval_expr",
-    "handle_expr",
-    "convert_to_bool",
-    "get_base_type_and_depth",
-    "deref_to_depth",
-    "get_operand_value",
-    "CallHandlerRegistry",
-]
+from .expr_pass import eval_expr, handle_expr
+from .type_normalization import convert_to_bool
+
+__all__ = ["eval_expr", "handle_expr", "convert_to_bool"]

pythonbpf/expr/call_registry.py

@@ -1,20 +0,0 @@
-class CallHandlerRegistry:
-    """Registry for handling different types of calls (helpers, etc.)"""
-
-    _handler = None
-
-    @classmethod
-    def set_handler(cls, handler):
-        """Set the handler for unknown calls"""
-        cls._handler = handler
-
-    @classmethod
-    def handle_call(
-        cls, call, module, builder, func, local_sym_tab, map_sym_tab, structs_sym_tab
-    ):
-        """Handle a call using the registered handler"""
-        if cls._handler is None:
-            return None
-        return cls._handler(
-            call, module, builder, func, local_sym_tab, map_sym_tab, structs_sym_tab
-        )

pythonbpf/expr/expr_pass.py

@@ -1,3 +1,11 @@
+"""
+Expression evaluation and LLVM IR generation.
+
+This module handles the evaluation of Python expressions in BPF programs,
+including variables, constants, function calls, comparisons, boolean
+operations, and more.
+"""
+
 import ast
 from llvmlite import ir
 from logging import Logger
@@ -5,20 +13,10 @@ import logging
 from typing import Dict
 
 from pythonbpf.type_deducer import ctypes_to_ir, is_ctypes
-from .call_registry import CallHandlerRegistry
-from .type_normalization import (
-    convert_to_bool,
-    handle_comparator,
-    get_base_type_and_depth,
-    deref_to_depth,
-)
+from .type_normalization import convert_to_bool, handle_comparator
 
 logger: Logger = logging.getLogger(__name__)
 
-# ============================================================================
-# Leaf Handlers (No Recursive eval_expr calls)
-# ============================================================================
-
 
 def _handle_name_expr(expr: ast.Name, local_sym_tab: Dict, builder: ir.IRBuilder):
     """Handle ast.Name expressions."""
@@ -31,26 +29,12 @@ def _handle_name_expr(expr: ast.Name, local_sym_tab: Dict, builder: ir.IRBuilder
         return None
 
 
-def _handle_constant_expr(module, builder, expr: ast.Constant):
+def _handle_constant_expr(expr: ast.Constant):
     """Handle ast.Constant expressions."""
     if isinstance(expr.value, int) or isinstance(expr.value, bool):
         return ir.Constant(ir.IntType(64), int(expr.value)), ir.IntType(64)
-    elif isinstance(expr.value, str):
-        str_name = f".str.{id(expr)}"
-        str_bytes = expr.value.encode("utf-8") + b"\x00"
-        str_type = ir.ArrayType(ir.IntType(8), len(str_bytes))
-        str_constant = ir.Constant(str_type, bytearray(str_bytes))
-
-        # Create global variable
-        global_str = ir.GlobalVariable(module, str_type, name=str_name)
-        global_str.linkage = "internal"
-        global_str.global_constant = True
-        global_str.initializer = str_constant
-
-        str_ptr = builder.bitcast(global_str, ir.PointerType(ir.IntType(8)))
-        return str_ptr, ir.PointerType(ir.IntType(8))
     else:
-        logger.error(f"Unsupported constant type {ast.dump(expr)}")
+        logger.error("Unsupported constant type")
         return None
 
 
@@ -112,118 +96,6 @@ def _handle_deref_call(expr: ast.Call, local_sym_tab: Dict, builder: ir.IRBuilde
     return val, local_sym_tab[arg.id].ir_type
 
 
-# ============================================================================
-# Binary Operations
-# ============================================================================
-
-
-def get_operand_value(
-    func, module, operand, builder, local_sym_tab, map_sym_tab, structs_sym_tab=None
-):
-    """Extract the value from an operand, handling variables and constants."""
-    logger.info(f"Getting operand value for: {ast.dump(operand)}")
-    if isinstance(operand, ast.Name):
-        if operand.id in local_sym_tab:
-            var = local_sym_tab[operand.id].var
-            var_type = var.type
-            base_type, depth = get_base_type_and_depth(var_type)
-            logger.info(f"var is {var}, base_type is {base_type}, depth is {depth}")
-            val = deref_to_depth(func, builder, var, depth)
-            return val
-        raise ValueError(f"Undefined variable: {operand.id}")
-    elif isinstance(operand, ast.Constant):
-        if isinstance(operand.value, int):
-            cst = ir.Constant(ir.IntType(64), int(operand.value))
-            return cst
-        raise TypeError(f"Unsupported constant type: {type(operand.value)}")
-    elif isinstance(operand, ast.BinOp):
-        res = _handle_binary_op_impl(
-            func, module, operand, builder, local_sym_tab, map_sym_tab, structs_sym_tab
-        )
-        return res
-    else:
-        res = eval_expr(
-            func, module, builder, operand, local_sym_tab, map_sym_tab, structs_sym_tab
-        )
-        if res is None:
-            raise ValueError(f"Failed to evaluate call expression: {operand}")
-        val, _ = res
-        logger.info(f"Evaluated expr to {val} of type {val.type}")
-        base_type, depth = get_base_type_and_depth(val.type)
-        if depth > 0:
-            val = deref_to_depth(func, builder, val, depth)
-        return val
-    raise TypeError(f"Unsupported operand type: {type(operand)}")
-
-
-def _handle_binary_op_impl(
-    func, module, rval, builder, local_sym_tab, map_sym_tab, structs_sym_tab=None
-):
-    op = rval.op
-    left = get_operand_value(
-        func, module, rval.left, builder, local_sym_tab, map_sym_tab, structs_sym_tab
-    )
-    right = get_operand_value(
-        func, module, rval.right, builder, local_sym_tab, map_sym_tab, structs_sym_tab
-    )
-    logger.info(f"left is {left}, right is {right}, op is {op}")
-
-    # NOTE: Before doing the operation, if the operands are integers
-    # we always extend them to i64. The assignment to LHS will take
-    # care of truncation if needed.
-    if isinstance(left.type, ir.IntType) and left.type.width < 64:
-        left = builder.sext(left, ir.IntType(64))
-    if isinstance(right.type, ir.IntType) and right.type.width < 64:
-        right = builder.sext(right, ir.IntType(64))
-
-    # Map AST operation nodes to LLVM IR builder methods
-    op_map = {
-        ast.Add: builder.add,
-        ast.Sub: builder.sub,
-        ast.Mult: builder.mul,
-        ast.Div: builder.sdiv,
-        ast.Mod: builder.srem,
-        ast.LShift: builder.shl,
-        ast.RShift: builder.lshr,
-        ast.BitOr: builder.or_,
-        ast.BitXor: builder.xor,
-        ast.BitAnd: builder.and_,
-        ast.FloorDiv: builder.udiv,
-    }
-
-    if type(op) in op_map:
-        result = op_map[type(op)](left, right)
-        return result
-    else:
-        raise SyntaxError("Unsupported binary operation")
-
-
-def _handle_binary_op(
-    func,
-    module,
-    rval,
-    builder,
-    var_name,
-    local_sym_tab,
-    map_sym_tab,
-    structs_sym_tab=None,
-):
-    result = _handle_binary_op_impl(
-        func, module, rval, builder, local_sym_tab, map_sym_tab, structs_sym_tab
-    )
-    if var_name and var_name in local_sym_tab:
-        logger.info(
-            f"Storing result {result} into variable {local_sym_tab[var_name].var}"
-        )
-        builder.store(result, local_sym_tab[var_name].var)
-    return result, result.type
-
-
-# ============================================================================
-# Comparison and Unary Operations
-# ============================================================================
-
-
 def _handle_ctypes_call(
     func,
     module,
@@ -312,31 +184,21 @@ def _handle_unary_op(
     structs_sym_tab=None,
 ):
     """Handle ast.UnaryOp expressions."""
-    if not isinstance(expr.op, ast.Not) and not isinstance(expr.op, ast.USub):
-        logger.error("Only 'not' and '-' unary operators are supported")
+    if not isinstance(expr.op, ast.Not):
+        logger.error("Only 'not' unary operator is supported")
         return None
 
-    operand = get_operand_value(
-        func, module, expr.operand, builder, local_sym_tab, map_sym_tab, structs_sym_tab
+    operand = eval_expr(
+        func, module, builder, expr.operand, local_sym_tab, map_sym_tab, structs_sym_tab
     )
     if operand is None:
         logger.error("Failed to evaluate operand for unary operation")
         return None
 
-    if isinstance(expr.op, ast.Not):
-        true_const = ir.Constant(ir.IntType(1), 1)
-        result = builder.xor(convert_to_bool(builder, operand), true_const)
-        return result, ir.IntType(1)
-    elif isinstance(expr.op, ast.USub):
-        # Multiply by -1
-        neg_one = ir.Constant(ir.IntType(64), -1)
-        result = builder.mul(operand, neg_one)
-        return result, ir.IntType(64)
-
-
-# ============================================================================
-# Boolean Operations
-# ============================================================================
+    operand_val, operand_type = operand
+    true_const = ir.Constant(ir.IntType(1), 1)
+    result = builder.xor(convert_to_bool(builder, operand_val), true_const)
+    return result, ir.IntType(1)
 
 
 def _handle_and_op(func, builder, expr, local_sym_tab, map_sym_tab, structs_sym_tab):
@@ -469,11 +331,6 @@ def _handle_boolean_op(
         return None
 
 
-# ============================================================================
-# Expression Dispatcher
-# ============================================================================
-
-
 def eval_expr(
     func,
     module,
@@ -483,11 +340,26 @@ def eval_expr(
     map_sym_tab,
     structs_sym_tab=None,
 ):
+    """
+    Evaluate an expression and return its LLVM IR value and type.
+
+    Args:
+        func: The LLVM IR function being built
+        module: The LLVM IR module
+        builder: LLVM IR builder
+        expr: The AST expression node to evaluate
+        local_sym_tab: Local symbol table
+        map_sym_tab: Map symbol table
+        structs_sym_tab: Struct symbol table
+
+    Returns:
+        A tuple of (value, type) or None if evaluation fails
+    """
     logger.info(f"Evaluating expression: {ast.dump(expr)}")
     if isinstance(expr, ast.Name):
         return _handle_name_expr(expr, local_sym_tab, builder)
     elif isinstance(expr, ast.Constant):
-        return _handle_constant_expr(module, builder, expr)
+        return _handle_constant_expr(expr)
     elif isinstance(expr, ast.Call):
         if isinstance(expr.func, ast.Name) and expr.func.id == "deref":
             return _handle_deref_call(expr, local_sym_tab, builder)
@@ -503,27 +375,57 @@ def eval_expr(
                 structs_sym_tab,
             )
 
-        result = CallHandlerRegistry.handle_call(
-            expr, module, builder, func, local_sym_tab, map_sym_tab, structs_sym_tab
-        )
-        if result is not None:
-            return result
+        # delayed import to avoid circular dependency
+        from pythonbpf.helper import HelperHandlerRegistry, handle_helper_call
 
-        logger.warning(f"Unknown call: {ast.dump(expr)}")
-        return None
+        if isinstance(expr.func, ast.Name) and HelperHandlerRegistry.has_handler(
+            expr.func.id
+        ):
+            return handle_helper_call(
+                expr,
+                module,
+                builder,
+                func,
+                local_sym_tab,
+                map_sym_tab,
+                structs_sym_tab,
+            )
+        elif isinstance(expr.func, ast.Attribute):
+            logger.info(f"Handling method call: {ast.dump(expr.func)}")
+            if isinstance(expr.func.value, ast.Call) and isinstance(
+                expr.func.value.func, ast.Name
+            ):
+                method_name = expr.func.attr
+                if HelperHandlerRegistry.has_handler(method_name):
+                    return handle_helper_call(
+                        expr,
+                        module,
+                        builder,
+                        func,
+                        local_sym_tab,
+                        map_sym_tab,
+                        structs_sym_tab,
+                    )
+            elif isinstance(expr.func.value, ast.Name):
+                obj_name = expr.func.value.id
+                method_name = expr.func.attr
+                if obj_name in map_sym_tab:
+                    if HelperHandlerRegistry.has_handler(method_name):
+                        return handle_helper_call(
+                            expr,
+                            module,
+                            builder,
+                            func,
+                            local_sym_tab,
+                            map_sym_tab,
+                            structs_sym_tab,
+                        )
     elif isinstance(expr, ast.Attribute):
         return _handle_attribute_expr(expr, local_sym_tab, structs_sym_tab, builder)
     elif isinstance(expr, ast.BinOp):
-        return _handle_binary_op(
-            func,
-            module,
-            expr,
-            builder,
-            None,
-            local_sym_tab,
-            map_sym_tab,
-            structs_sym_tab,
-        )
+        from pythonbpf.binary_ops import handle_binary_op
+
+        return handle_binary_op(expr, builder, None, local_sym_tab)
     elif isinstance(expr, ast.Compare):
         return _handle_compare(
             func, module, builder, expr, local_sym_tab, map_sym_tab, structs_sym_tab

pythonbpf/expr/ir_ops.py

@@ -1,50 +0,0 @@
-import logging
-from llvmlite import ir
-
-logger = logging.getLogger(__name__)
-
-
-def deref_to_depth(func, builder, val, target_depth):
-    """Dereference a pointer to a certain depth."""
-
-    cur_val = val
-    cur_type = val.type
-
-    for depth in range(target_depth):
-        if not isinstance(val.type, ir.PointerType):
-            logger.error("Cannot dereference further, non-pointer type")
-            return None
-
-        # dereference with null check
-        pointee_type = cur_type.pointee
-        null_check_block = builder.block
-        not_null_block = func.append_basic_block(name=f"deref_not_null_{depth}")
-        merge_block = func.append_basic_block(name=f"deref_merge_{depth}")
-
-        null_ptr = ir.Constant(cur_type, None)
-        is_not_null = builder.icmp_signed("!=", cur_val, null_ptr)
-        logger.debug(f"Inserted null check for pointer at depth {depth}")
-
-        builder.cbranch(is_not_null, not_null_block, merge_block)
-
-        builder.position_at_end(not_null_block)
-        dereferenced_val = builder.load(cur_val)
-        logger.debug(f"Dereferenced to depth {depth - 1}, type: {pointee_type}")
-        builder.branch(merge_block)
-
-        builder.position_at_end(merge_block)
-        phi = builder.phi(pointee_type, name=f"deref_result_{depth}")
-
-        zero_value = (
-            ir.Constant(pointee_type, 0)
-            if isinstance(pointee_type, ir.IntType)
-            else ir.Constant(pointee_type, None)
-        )
-        phi.add_incoming(zero_value, null_check_block)
-
-        phi.add_incoming(dereferenced_val, not_null_block)
-
-        # Continue with phi result
-        cur_val = phi
-        cur_type = pointee_type
-    return cur_val

pythonbpf/expr/type_normalization.py

@@ -1,7 +1,13 @@
+"""
+Type normalization and comparison operations for expressions.
+
+This module provides utilities for normalizing types between expressions,
+handling pointer dereferencing, and generating comparison operations.
+"""
+
+from llvmlite import ir
 import logging
 import ast
-from llvmlite import ir
-from .ir_ops import deref_to_depth
 
 logger = logging.getLogger(__name__)
 
@@ -17,8 +23,16 @@ COMPARISON_OPS = {
 }
 
 
-def get_base_type_and_depth(ir_type):
-    """Get the base type for pointer types."""
+def _get_base_type_and_depth(ir_type):
+    """
+    Get the base type and pointer depth for an LLVM IR type.
+
+    Args:
+        ir_type: The LLVM IR type to analyze
+
+    Returns:
+        A tuple of (base_type, depth) where depth is the number of pointer levels
+    """
     cur_type = ir_type
     depth = 0
     while isinstance(cur_type, ir.PointerType):
@@ -27,8 +41,76 @@ def get_base_type_and_depth(ir_type):
     return cur_type, depth
 
 
+def _deref_to_depth(func, builder, val, target_depth):
+    """
+    Dereference a pointer to a certain depth with null checks.
+
+    Args:
+        func: The LLVM IR function being built
+        builder: LLVM IR builder
+        val: The pointer value to dereference
+        target_depth: Number of levels to dereference
+
+    Returns:
+        The dereferenced value, or None if dereferencing fails
+    """
+
+    cur_val = val
+    cur_type = val.type
+
+    for depth in range(target_depth):
+        if not isinstance(val.type, ir.PointerType):
+            logger.error("Cannot dereference further, non-pointer type")
+            return None
+
+        # dereference with null check
+        pointee_type = cur_type.pointee
+        null_check_block = builder.block
+        not_null_block = func.append_basic_block(name=f"deref_not_null_{depth}")
+        merge_block = func.append_basic_block(name=f"deref_merge_{depth}")
+
+        null_ptr = ir.Constant(cur_type, None)
+        is_not_null = builder.icmp_signed("!=", cur_val, null_ptr)
+        logger.debug(f"Inserted null check for pointer at depth {depth}")
+
+        builder.cbranch(is_not_null, not_null_block, merge_block)
+
+        builder.position_at_end(not_null_block)
+        dereferenced_val = builder.load(cur_val)
+        logger.debug(f"Dereferenced to depth {depth - 1}, type: {pointee_type}")
+        builder.branch(merge_block)
+
+        builder.position_at_end(merge_block)
+        phi = builder.phi(pointee_type, name=f"deref_result_{depth}")
+
+        zero_value = (
+            ir.Constant(pointee_type, 0)
+            if isinstance(pointee_type, ir.IntType)
+            else ir.Constant(pointee_type, None)
+        )
+        phi.add_incoming(zero_value, null_check_block)
+
+        phi.add_incoming(dereferenced_val, not_null_block)
+
+        # Continue with phi result
+        cur_val = phi
+        cur_type = pointee_type
+    return cur_val
+
+
 def _normalize_types(func, builder, lhs, rhs):
-    """Normalize types for comparison."""
+    """
+    Normalize types for comparison by casting or dereferencing as needed.
+
+    Args:
+        func: The LLVM IR function being built
+        builder: LLVM IR builder
+        lhs: Left-hand side value
+        rhs: Right-hand side value
+
+    Returns:
+        A tuple of (normalized_lhs, normalized_rhs) or (None, None) on error
+    """
 
     logger.info(f"Normalizing types: {lhs.type} vs {rhs.type}")
     if isinstance(lhs.type, ir.IntType) and isinstance(rhs.type, ir.IntType):
@@ -43,18 +125,27 @@ def _normalize_types(func, builder, lhs, rhs):
         logger.error(f"Type mismatch: {lhs.type} vs {rhs.type}")
         return None, None
     else:
-        lhs_base, lhs_depth = get_base_type_and_depth(lhs.type)
-        rhs_base, rhs_depth = get_base_type_and_depth(rhs.type)
+        lhs_base, lhs_depth = _get_base_type_and_depth(lhs.type)
+        rhs_base, rhs_depth = _get_base_type_and_depth(rhs.type)
         if lhs_base == rhs_base:
             if lhs_depth < rhs_depth:
-                rhs = deref_to_depth(func, builder, rhs, rhs_depth - lhs_depth)
+                rhs = _deref_to_depth(func, builder, rhs, rhs_depth - lhs_depth)
             elif rhs_depth < lhs_depth:
-                lhs = deref_to_depth(func, builder, lhs, lhs_depth - rhs_depth)
+                lhs = _deref_to_depth(func, builder, lhs, lhs_depth - rhs_depth)
             return _normalize_types(func, builder, lhs, rhs)
 
 
 def convert_to_bool(builder, val):
-    """Convert a value to boolean."""
+    """
+    Convert an LLVM IR value to a boolean (i1) type.
+
+    Args:
+        builder: LLVM IR builder
+        val: The value to convert
+
+    Returns:
+        An i1 boolean value
+    """
     if val.type == ir.IntType(1):
         return val
     if isinstance(val.type, ir.PointerType):
@@ -65,7 +156,19 @@ def convert_to_bool(builder, val):
 
 
 def handle_comparator(func, builder, op, lhs, rhs):
-    """Handle comparison operations."""
+    """
+    Handle comparison operations between two values.
+
+    Args:
+        func: The LLVM IR function being built
+        builder: LLVM IR builder
+        op: The AST comparison operator node
+        lhs: Left-hand side value
+        rhs: Right-hand side value
+
+    Returns:
+        A tuple of (result, ir.IntType(1)) or None on error
+    """
 
     if lhs.type != rhs.type:
         lhs, rhs = _normalize_types(func, builder, lhs, rhs)

pythonbpf/functions/__init__.py

@@ -1,3 +1,5 @@
+"""BPF function processing and LLVM IR generation."""
+
 from .functions_pass import func_proc
 
 __all__ = ["func_proc"]

pythonbpf/functions/func_registry_handlers.py

@@ -0,0 +1,25 @@
+"""Registry for statement handler functions."""
+
+from typing import Dict
+
+
+class StatementHandlerRegistry:
+    """Registry for statement handlers."""
+
+    _handlers: Dict = {}
+
+    @classmethod
+    def register(cls, stmt_type):
+        """Register a handler for a specific statement type."""
+
+        def decorator(handler):
+            """Decorator that registers the handler."""
+            cls._handlers[stmt_type] = handler
+            return handler
+
+        return decorator
+
+    @classmethod
+    def __getitem__(cls, stmt_type):
+        """Get the handler for a specific statement type."""
+        return cls._handlers.get(stmt_type, None)

pythonbpf/functions/function_metadata.py

@@ -1,88 +0,0 @@
-import ast
-
-
-def get_probe_string(func_node):
-    """Extract the probe string from the decorator of the function node"""
-    # TODO: right now we have the whole string in the section decorator
-    # But later we can implement typed tuples for tracepoints and kprobes
-    # For helper functions, we return "helper"
-
-    for decorator in func_node.decorator_list:
-        if isinstance(decorator, ast.Name) and decorator.id == "bpfglobal":
-            return None
-        if isinstance(decorator, ast.Call) and isinstance(decorator.func, ast.Name):
-            if decorator.func.id == "section" and len(decorator.args) == 1:
-                arg = decorator.args[0]
-                if isinstance(arg, ast.Constant) and isinstance(arg.value, str):
-                    return arg.value
-    return "helper"
-
-
-def is_global_function(func_node):
-    """Check if the function is a global"""
-    for decorator in func_node.decorator_list:
-        if isinstance(decorator, ast.Name) and decorator.id in (
-            "map",
-            "bpfglobal",
-            "struct",
-        ):
-            return True
-    return False
-
-
-def infer_return_type(func_node: ast.FunctionDef):
-    if not isinstance(func_node, (ast.FunctionDef, ast.AsyncFunctionDef)):
-        raise TypeError("Expected ast.FunctionDef")
-    if func_node.returns is not None:
-        try:
-            return ast.unparse(func_node.returns)
-        except Exception:
-            node = func_node.returns
-            if isinstance(node, ast.Name):
-                return node.id
-            if isinstance(node, ast.Attribute):
-                return getattr(node, "attr", type(node).__name__)
-            try:
-                return str(node)
-            except Exception:
-                return type(node).__name__
-    found_type = None
-
-    def _expr_type(e):
-        if e is None:
-            return "None"
-        if isinstance(e, ast.Constant):
-            return type(e.value).__name__
-        if isinstance(e, ast.Name):
-            return e.id
-        if isinstance(e, ast.Call):
-            f = e.func
-            if isinstance(f, ast.Name):
-                return f.id
-            if isinstance(f, ast.Attribute):
-                try:
-                    return ast.unparse(f)
-                except Exception:
-                    return getattr(f, "attr", type(f).__name__)
-            try:
-                return ast.unparse(f)
-            except Exception:
-                return type(f).__name__
-        if isinstance(e, ast.Attribute):
-            try:
-                return ast.unparse(e)
-            except Exception:
-                return getattr(e, "attr", type(e).__name__)
-        try:
-            return ast.unparse(e)
-        except Exception:
-            return type(e).__name__
-
-    for walked_node in ast.walk(func_node):
-        if isinstance(walked_node, ast.Return):
-            t = _expr_type(walked_node.value)
-            if found_type is None:
-                found_type = t
-            elif found_type != t:
-                raise ValueError(f"Conflicting return types: {found_type} vs {t}")
-    return found_type or "None"

pythonbpf/functions/functions_pass.py

@@ -1,192 +1,281 @@
+"""
+BPF function processing and LLVM IR generation.
+
+This module handles the core function processing, converting Python function
+definitions into LLVM IR for BPF programs. It manages local variables,
+control flow, and statement processing.
+"""
+
 from llvmlite import ir
 import ast
 import logging
+from typing import Any
+from dataclasses import dataclass
 
-from pythonbpf.helper import (
-    HelperHandlerRegistry,
-    reset_scratch_pool,
-)
+from pythonbpf.helper import HelperHandlerRegistry, handle_helper_call
 from pythonbpf.type_deducer import ctypes_to_ir
+from pythonbpf.binary_ops import handle_binary_op
 from pythonbpf.expr import eval_expr, handle_expr, convert_to_bool
-from pythonbpf.assign_pass import (
-    handle_variable_assignment,
-    handle_struct_field_assignment,
-)
-from pythonbpf.allocation_pass import handle_assign_allocation, allocate_temp_pool
 
-from .return_utils import handle_none_return, handle_xdp_return, is_xdp_name
-from .function_metadata import get_probe_string, is_global_function, infer_return_type
+from .return_utils import _handle_none_return, _handle_xdp_return, _is_xdp_name
 
 
 logger = logging.getLogger(__name__)
 
 
-# ============================================================================
-# SECTION 1: Memory Allocation
-# ============================================================================
+@dataclass
+class LocalSymbol:
+    """
+    Represents a local variable in a BPF function.
+
+    Attributes:
+        var: LLVM IR alloca instruction for the variable
+        ir_type: LLVM IR type of the variable
+        metadata: Optional metadata (e.g., struct type name)
+    """
+
+    var: ir.AllocaInstr
+    ir_type: ir.Type
+    metadata: Any = None
+
+    def __iter__(self):
+        """Support tuple unpacking of LocalSymbol."""
+        yield self.var
+        yield self.ir_type
+        yield self.metadata
 
 
-def count_temps_in_call(call_node, local_sym_tab):
-    """Count the number of temporary variables needed for a function call."""
+def get_probe_string(func_node):
+    """Extract the probe string from the decorator of the function node."""
+    # TODO: right now we have the whole string in the section decorator
+    # But later we can implement typed tuples for tracepoints and kprobes
+    # For helper functions, we return "helper"
 
-    count = 0
-    is_helper = False
-
-    # NOTE: We exclude print calls for now
-    if isinstance(call_node.func, ast.Name):
-        if (
-            HelperHandlerRegistry.has_handler(call_node.func.id)
-            and call_node.func.id != "print"
-        ):
-            is_helper = True
-    elif isinstance(call_node.func, ast.Attribute):
-        if HelperHandlerRegistry.has_handler(call_node.func.attr):
-            is_helper = True
-
-    if not is_helper:
-        return 0
-
-    for arg in call_node.args:
-        # NOTE: Count all non-name arguments
-        # For struct fields, if it is being passed as an argument,
-        # The struct object should already exist in the local_sym_tab
-        if not isinstance(arg, ast.Name) and not (
-            isinstance(arg, ast.Attribute) and arg.value.id in local_sym_tab
-        ):
-            count += 1
-
-    return count
-
-
-def handle_if_allocation(
-    module, builder, stmt, func, ret_type, map_sym_tab, local_sym_tab, structs_sym_tab
-):
-    """Recursively handle allocations in if/else branches."""
-    if stmt.body:
-        allocate_mem(
-            module,
-            builder,
-            stmt.body,
-            func,
-            ret_type,
-            map_sym_tab,
-            local_sym_tab,
-            structs_sym_tab,
-        )
-    if stmt.orelse:
-        allocate_mem(
-            module,
-            builder,
-            stmt.orelse,
-            func,
-            ret_type,
-            map_sym_tab,
-            local_sym_tab,
-            structs_sym_tab,
-        )
-
-
-def allocate_mem(
-    module, builder, body, func, ret_type, map_sym_tab, local_sym_tab, structs_sym_tab
-):
-    max_temps_needed = 0
-
-    def update_max_temps_for_stmt(stmt):
-        nonlocal max_temps_needed
-        temps_needed = 0
-
-        if isinstance(stmt, ast.If):
-            for s in stmt.body:
-                update_max_temps_for_stmt(s)
-            for s in stmt.orelse:
-                update_max_temps_for_stmt(s)
-            return
-
-        for node in ast.walk(stmt):
-            if isinstance(node, ast.Call):
-                temps_needed += count_temps_in_call(node, local_sym_tab)
-        max_temps_needed = max(max_temps_needed, temps_needed)
-
-    for stmt in body:
-        update_max_temps_for_stmt(stmt)
-
-        # Handle allocations
-        if isinstance(stmt, ast.If):
-            handle_if_allocation(
-                module,
-                builder,
-                stmt,
-                func,
-                ret_type,
-                map_sym_tab,
-                local_sym_tab,
-                structs_sym_tab,
-            )
-        elif isinstance(stmt, ast.Assign):
-            handle_assign_allocation(builder, stmt, local_sym_tab, structs_sym_tab)
-
-    allocate_temp_pool(builder, max_temps_needed, local_sym_tab)
-
-    return local_sym_tab
-
-
-# ============================================================================
-# SECTION 2: Statement Handlers
-# ============================================================================
+    for decorator in func_node.decorator_list:
+        if isinstance(decorator, ast.Name) and decorator.id == "bpfglobal":
+            return None
+        if isinstance(decorator, ast.Call) and isinstance(decorator.func, ast.Name):
+            if decorator.func.id == "section" and len(decorator.args) == 1:
+                arg = decorator.args[0]
+                if isinstance(arg, ast.Constant) and isinstance(arg.value, str):
+                    return arg.value
+    return "helper"
 
 
 def handle_assign(
     func, module, builder, stmt, map_sym_tab, local_sym_tab, structs_sym_tab
 ):
     """Handle assignment statements in the function body."""
-
-    # TODO: Support this later
-    # GH #37
     if len(stmt.targets) != 1:
-        logger.error("Multi-target assignment is not supported for now")
+        logger.info("Unsupported multiassignment")
         return
 
+    num_types = ("c_int32", "c_int64", "c_uint32", "c_uint64")
+
     target = stmt.targets[0]
+    logger.info(f"Handling assignment to {ast.dump(target)}")
+    if not isinstance(target, ast.Name) and not isinstance(target, ast.Attribute):
+        logger.info("Unsupported assignment target")
+        return
+    var_name = target.id if isinstance(target, ast.Name) else target.value.id
     rval = stmt.value
-
-    if isinstance(target, ast.Name):
-        # NOTE: Simple variable assignment case: x = 5
-        var_name = target.id
-        result = handle_variable_assignment(
-            func,
-            module,
-            builder,
-            var_name,
-            rval,
-            local_sym_tab,
-            map_sym_tab,
-            structs_sym_tab,
-        )
-        if not result:
-            logger.error(f"Failed to handle assignment to {var_name}")
-        return
-
     if isinstance(target, ast.Attribute):
-        # NOTE: Struct field assignment case: pkt.field = value
-        handle_struct_field_assignment(
-            func,
-            module,
-            builder,
-            target,
-            rval,
-            local_sym_tab,
-            map_sym_tab,
-            structs_sym_tab,
-        )
-        return
-
-    # Unsupported target type
-    logger.error(f"Unsupported assignment target: {ast.dump(target)}")
+        # struct field assignment
+        field_name = target.attr
+        if var_name in local_sym_tab:
+            struct_type = local_sym_tab[var_name].metadata
+            struct_info = structs_sym_tab[struct_type]
+            if field_name in struct_info.fields:
+                field_ptr = struct_info.gep(
+                    builder, local_sym_tab[var_name].var, field_name
+                )
+                val = eval_expr(
+                    func,
+                    module,
+                    builder,
+                    rval,
+                    local_sym_tab,
+                    map_sym_tab,
+                    structs_sym_tab,
+                )
+                if isinstance(struct_info.field_type(field_name), ir.ArrayType) and val[
+                    1
+                ] == ir.PointerType(ir.IntType(8)):
+                    # TODO: Figure it out, not a priority rn
+                    # Special case for string assignment to char array
+                    # str_len = struct_info["field_types"][field_idx].count
+                    # assign_string_to_array(builder, field_ptr, val[0], str_len)
+                    # print(f"Assigned to struct field {var_name}.{field_name}")
+                    pass
+                if val is None:
+                    logger.info("Failed to evaluate struct field assignment")
+                    return
+                logger.info(field_ptr)
+                builder.store(val[0], field_ptr)
+                logger.info(f"Assigned to struct field {var_name}.{field_name}")
+                return
+    elif isinstance(rval, ast.Constant):
+        if isinstance(rval.value, bool):
+            if rval.value:
+                builder.store(
+                    ir.Constant(ir.IntType(1), 1), local_sym_tab[var_name].var
+                )
+            else:
+                builder.store(
+                    ir.Constant(ir.IntType(1), 0), local_sym_tab[var_name].var
+                )
+            logger.info(f"Assigned constant {rval.value} to {var_name}")
+        elif isinstance(rval.value, int):
+            # Assume c_int64 for now
+            # var = builder.alloca(ir.IntType(64), name=var_name)
+            # var.align = 8
+            builder.store(
+                ir.Constant(ir.IntType(64), rval.value), local_sym_tab[var_name].var
+            )
+            logger.info(f"Assigned constant {rval.value} to {var_name}")
+        elif isinstance(rval.value, str):
+            str_val = rval.value.encode("utf-8") + b"\x00"
+            str_const = ir.Constant(
+                ir.ArrayType(ir.IntType(8), len(str_val)), bytearray(str_val)
+            )
+            global_str = ir.GlobalVariable(
+                module, str_const.type, name=f"{var_name}_str"
+            )
+            global_str.linkage = "internal"
+            global_str.global_constant = True
+            global_str.initializer = str_const
+            str_ptr = builder.bitcast(global_str, ir.PointerType(ir.IntType(8)))
+            builder.store(str_ptr, local_sym_tab[var_name].var)
+            logger.info(f"Assigned string constant '{rval.value}' to {var_name}")
+        else:
+            logger.info("Unsupported constant type")
+    elif isinstance(rval, ast.Call):
+        if isinstance(rval.func, ast.Name):
+            call_type = rval.func.id
+            logger.info(f"Assignment call type: {call_type}")
+            if (
+                call_type in num_types
+                and len(rval.args) == 1
+                and isinstance(rval.args[0], ast.Constant)
+                and isinstance(rval.args[0].value, int)
+            ):
+                ir_type = ctypes_to_ir(call_type)
+                # var = builder.alloca(ir_type, name=var_name)
+                # var.align = ir_type.width // 8
+                builder.store(
+                    ir.Constant(ir_type, rval.args[0].value),
+                    local_sym_tab[var_name].var,
+                )
+                logger.info(
+                    f"Assigned {call_type} constant {rval.args[0].value} to {var_name}"
+                )
+            elif HelperHandlerRegistry.has_handler(call_type):
+                # var = builder.alloca(ir.IntType(64), name=var_name)
+                # var.align = 8
+                val = handle_helper_call(
+                    rval,
+                    module,
+                    builder,
+                    func,
+                    local_sym_tab,
+                    map_sym_tab,
+                    structs_sym_tab,
+                )
+                builder.store(val[0], local_sym_tab[var_name].var)
+                logger.info(f"Assigned constant {rval.func.id} to {var_name}")
+            elif call_type == "deref" and len(rval.args) == 1:
+                logger.info(f"Handling deref assignment {ast.dump(rval)}")
+                val = eval_expr(
+                    func,
+                    module,
+                    builder,
+                    rval,
+                    local_sym_tab,
+                    map_sym_tab,
+                    structs_sym_tab,
+                )
+                if val is None:
+                    logger.info("Failed to evaluate deref argument")
+                    return
+                logger.info(f"Dereferenced value: {val}, storing in {var_name}")
+                builder.store(val[0], local_sym_tab[var_name].var)
+                logger.info(f"Dereferenced and assigned to {var_name}")
+            elif call_type in structs_sym_tab and len(rval.args) == 0:
+                struct_info = structs_sym_tab[call_type]
+                ir_type = struct_info.ir_type
+                # var = builder.alloca(ir_type, name=var_name)
+                # Null init
+                builder.store(ir.Constant(ir_type, None), local_sym_tab[var_name].var)
+                logger.info(f"Assigned struct {call_type} to {var_name}")
+            else:
+                logger.info(f"Unsupported assignment call type: {call_type}")
+        elif isinstance(rval.func, ast.Attribute):
+            logger.info(f"Assignment call attribute: {ast.dump(rval.func)}")
+            if isinstance(rval.func.value, ast.Name):
+                if rval.func.value.id in map_sym_tab:
+                    map_name = rval.func.value.id
+                    method_name = rval.func.attr
+                    if HelperHandlerRegistry.has_handler(method_name):
+                        val = handle_helper_call(
+                            rval,
+                            module,
+                            builder,
+                            func,
+                            local_sym_tab,
+                            map_sym_tab,
+                            structs_sym_tab,
+                        )
+                        builder.store(val[0], local_sym_tab[var_name].var)
+                else:
+                    # TODO: probably a struct access
+                    logger.info(f"TODO STRUCT ACCESS {ast.dump(rval)}")
+            elif isinstance(rval.func.value, ast.Call) and isinstance(
+                rval.func.value.func, ast.Name
+            ):
+                map_name = rval.func.value.func.id
+                method_name = rval.func.attr
+                if map_name in map_sym_tab:
+                    if HelperHandlerRegistry.has_handler(method_name):
+                        val = handle_helper_call(
+                            rval,
+                            module,
+                            builder,
+                            func,
+                            local_sym_tab,
+                            map_sym_tab,
+                            structs_sym_tab,
+                        )
+                        # var = builder.alloca(ir.IntType(64), name=var_name)
+                        # var.align = 8
+                        builder.store(val[0], local_sym_tab[var_name].var)
+            else:
+                logger.info("Unsupported assignment call structure")
+        else:
+            logger.info("Unsupported assignment call function type")
+    elif isinstance(rval, ast.BinOp):
+        handle_binary_op(rval, builder, var_name, local_sym_tab)
+    else:
+        logger.info("Unsupported assignment value type")
 
 
 def handle_cond(
     func, module, builder, cond, local_sym_tab, map_sym_tab, structs_sym_tab=None
 ):
+    """
+    Evaluate a condition expression and convert it to a boolean value.
+
+    Args:
+        func: The LLVM IR function being built
+        module: The LLVM IR module
+        builder: LLVM IR builder
+        cond: The AST condition node to evaluate
+        local_sym_tab: Local symbol table
+        map_sym_tab: Map symbol table
+        structs_sym_tab: Struct symbol table
+
+    Returns:
+        LLVM IR boolean value representing the condition result
+    """
     val = eval_expr(
         func, module, builder, cond, local_sym_tab, map_sym_tab, structs_sym_tab
     )[0]
@@ -242,11 +331,23 @@ def handle_if(
 
 
 def handle_return(builder, stmt, local_sym_tab, ret_type):
+    """
+    Handle return statements in BPF functions.
+
+    Args:
+        builder: LLVM IR builder
+        stmt: The AST Return node
+        local_sym_tab: Local symbol table
+        ret_type: Expected return type
+
+    Returns:
+        True if a return was emitted, False otherwise
+    """
     logger.info(f"Handling return statement: {ast.dump(stmt)}")
     if stmt.value is None:
-        return handle_none_return(builder)
-    elif isinstance(stmt.value, ast.Name) and is_xdp_name(stmt.value.id):
-        return handle_xdp_return(stmt, builder, ret_type)
+        return _handle_none_return(builder)
+    elif isinstance(stmt.value, ast.Name) and _is_xdp_name(stmt.value.id):
+        return _handle_xdp_return(stmt, builder, ret_type)
     else:
         val = eval_expr(
             func=None,
@@ -273,8 +374,24 @@ def process_stmt(
     did_return,
     ret_type=ir.IntType(64),
 ):
+    """
+    Process a single statement in a BPF function.
+
+    Args:
+        func: The LLVM IR function being built
+        module: The LLVM IR module
+        builder: LLVM IR builder
+        stmt: The AST statement node to process
+        local_sym_tab: Local symbol table
+        map_sym_tab: Map symbol table
+        structs_sym_tab: Struct symbol table
+        did_return: Whether a return has been emitted
+        ret_type: Expected return type
+
+    Returns:
+        True if a return was emitted, False otherwise
+    """
     logger.info(f"Processing statement: {ast.dump(stmt)}")
-    reset_scratch_pool()
     if isinstance(stmt, ast.Expr):
         handle_expr(
             func,
@@ -305,9 +422,139 @@ def process_stmt(
     return did_return
 
 
-# ============================================================================
-# SECTION 3: Function Body Processing
-# ============================================================================
+def allocate_mem(
+    module, builder, body, func, ret_type, map_sym_tab, local_sym_tab, structs_sym_tab
+):
+    """
+    Pre-allocate stack memory for local variables in a BPF function.
+
+    This function scans the function body and creates alloca instructions
+    for all local variables before processing the function statements.
+
+    Args:
+        module: The LLVM IR module
+        builder: LLVM IR builder
+        body: List of AST statements in the function body
+        func: The LLVM IR function being built
+        ret_type: Expected return type
+        map_sym_tab: Map symbol table
+        local_sym_tab: Local symbol table to populate
+        structs_sym_tab: Struct symbol table
+
+    Returns:
+        Updated local symbol table
+    """
+    for stmt in body:
+        has_metadata = False
+        if isinstance(stmt, ast.If):
+            if stmt.body:
+                local_sym_tab = allocate_mem(
+                    module,
+                    builder,
+                    stmt.body,
+                    func,
+                    ret_type,
+                    map_sym_tab,
+                    local_sym_tab,
+                    structs_sym_tab,
+                )
+            if stmt.orelse:
+                local_sym_tab = allocate_mem(
+                    module,
+                    builder,
+                    stmt.orelse,
+                    func,
+                    ret_type,
+                    map_sym_tab,
+                    local_sym_tab,
+                    structs_sym_tab,
+                )
+        elif isinstance(stmt, ast.Assign):
+            if len(stmt.targets) != 1:
+                logger.info("Unsupported multiassignment")
+                continue
+            target = stmt.targets[0]
+            if not isinstance(target, ast.Name):
+                logger.info("Unsupported assignment target")
+                continue
+            var_name = target.id
+            rval = stmt.value
+            if var_name in local_sym_tab:
+                logger.info(f"Variable {var_name} already allocated")
+                continue
+            if isinstance(rval, ast.Call):
+                if isinstance(rval.func, ast.Name):
+                    call_type = rval.func.id
+                    if call_type in ("c_int32", "c_int64", "c_uint32", "c_uint64"):
+                        ir_type = ctypes_to_ir(call_type)
+                        var = builder.alloca(ir_type, name=var_name)
+                        var.align = ir_type.width // 8
+                        logger.info(
+                            f"Pre-allocated variable {var_name} of type {call_type}"
+                        )
+                    elif HelperHandlerRegistry.has_handler(call_type):
+                        # Assume return type is int64 for now
+                        ir_type = ir.IntType(64)
+                        var = builder.alloca(ir_type, name=var_name)
+                        var.align = ir_type.width // 8
+                        logger.info(f"Pre-allocated variable {var_name} for helper")
+                    elif call_type == "deref" and len(rval.args) == 1:
+                        # Assume return type is int64 for now
+                        ir_type = ir.IntType(64)
+                        var = builder.alloca(ir_type, name=var_name)
+                        var.align = ir_type.width // 8
+                        logger.info(f"Pre-allocated variable {var_name} for deref")
+                    elif call_type in structs_sym_tab:
+                        struct_info = structs_sym_tab[call_type]
+                        ir_type = struct_info.ir_type
+                        var = builder.alloca(ir_type, name=var_name)
+                        has_metadata = True
+                        logger.info(
+                            f"Pre-allocated variable {var_name} for struct {call_type}"
+                        )
+                elif isinstance(rval.func, ast.Attribute):
+                    ir_type = ir.PointerType(ir.IntType(64))
+                    var = builder.alloca(ir_type, name=var_name)
+                    # var.align = ir_type.width // 8
+                    logger.info(f"Pre-allocated variable {var_name} for map")
+                else:
+                    logger.info("Unsupported assignment call function type")
+                    continue
+            elif isinstance(rval, ast.Constant):
+                if isinstance(rval.value, bool):
+                    ir_type = ir.IntType(1)
+                    var = builder.alloca(ir_type, name=var_name)
+                    var.align = 1
+                    logger.info(f"Pre-allocated variable {var_name} of type c_bool")
+                elif isinstance(rval.value, int):
+                    # Assume c_int64 for now
+                    ir_type = ir.IntType(64)
+                    var = builder.alloca(ir_type, name=var_name)
+                    var.align = ir_type.width // 8
+                    logger.info(f"Pre-allocated variable {var_name} of type c_int64")
+                elif isinstance(rval.value, str):
+                    ir_type = ir.PointerType(ir.IntType(8))
+                    var = builder.alloca(ir_type, name=var_name)
+                    var.align = 8
+                    logger.info(f"Pre-allocated variable {var_name} of type string")
+                else:
+                    logger.info("Unsupported constant type")
+                    continue
+            elif isinstance(rval, ast.BinOp):
+                # Assume c_int64 for now
+                ir_type = ir.IntType(64)
+                var = builder.alloca(ir_type, name=var_name)
+                var.align = ir_type.width // 8
+                logger.info(f"Pre-allocated variable {var_name} of type c_int64")
+            else:
+                logger.info("Unsupported assignment value type")
+                continue
+
+            if has_metadata:
+                local_sym_tab[var_name] = LocalSymbol(var, ir_type, call_type)
+            else:
+                local_sym_tab[var_name] = LocalSymbol(var, ir_type)
+    return local_sym_tab
 
 
 def process_func_body(
@@ -389,14 +636,28 @@ def process_bpf_chunk(func_node, module, return_type, map_sym_tab, structs_sym_t
     return func
 
 
-# ============================================================================
-# SECTION 4: Top-Level Function Processor
-# ============================================================================
-
-
 def func_proc(tree, module, chunks, map_sym_tab, structs_sym_tab):
+    """
+    Process all BPF function chunks and generate LLVM IR.
+
+    Args:
+        tree: The Python AST (not used in current implementation)
+        module: The LLVM IR module to add functions to
+        chunks: List of AST function nodes decorated with @bpf
+        map_sym_tab: Map symbol table
+        structs_sym_tab: Struct symbol table
+    """
     for func_node in chunks:
-        if is_global_function(func_node):
+        is_global = False
+        for decorator in func_node.decorator_list:
+            if isinstance(decorator, ast.Name) and decorator.id in (
+                "map",
+                "bpfglobal",
+                "struct",
+            ):
+                is_global = True
+                break
+        if is_global:
             continue
         func_type = get_probe_string(func_node)
         logger.info(f"Found probe_string of {func_node.name}: {func_type}")
@@ -410,7 +671,80 @@ def func_proc(tree, module, chunks, map_sym_tab, structs_sym_tab):
         )
 
 
-# TODO: WIP, for string assignment to fixed-size arrays
+def infer_return_type(func_node: ast.FunctionDef):
+    """
+    Infer the return type of a BPF function from annotations or return statements.
+
+    Args:
+        func_node: The AST function node
+
+    Returns:
+        String representation of the return type (e.g., 'c_int64')
+
+    Raises:
+        TypeError: If func_node is not a FunctionDef
+    """
+    if not isinstance(func_node, (ast.FunctionDef, ast.AsyncFunctionDef)):
+        raise TypeError("Expected ast.FunctionDef")
+    if func_node.returns is not None:
+        try:
+            return ast.unparse(func_node.returns)
+        except Exception:
+            node = func_node.returns
+            if isinstance(node, ast.Name):
+                return node.id
+            if isinstance(node, ast.Attribute):
+                return getattr(node, "attr", type(node).__name__)
+            try:
+                return str(node)
+            except Exception:
+                return type(node).__name__
+    found_type = None
+
+    def _expr_type(e):
+        """Helper function to extract type from an expression."""
+        if e is None:
+            return "None"
+        if isinstance(e, ast.Constant):
+            return type(e.value).__name__
+        if isinstance(e, ast.Name):
+            return e.id
+        if isinstance(e, ast.Call):
+            f = e.func
+            if isinstance(f, ast.Name):
+                return f.id
+            if isinstance(f, ast.Attribute):
+                try:
+                    return ast.unparse(f)
+                except Exception:
+                    return getattr(f, "attr", type(f).__name__)
+            try:
+                return ast.unparse(f)
+            except Exception:
+                return type(f).__name__
+        if isinstance(e, ast.Attribute):
+            try:
+                return ast.unparse(e)
+            except Exception:
+                return getattr(e, "attr", type(e).__name__)
+        try:
+            return ast.unparse(e)
+        except Exception:
+            return type(e).__name__
+
+    for walked_node in ast.walk(func_node):
+        if isinstance(walked_node, ast.Return):
+            t = _expr_type(walked_node.value)
+            if found_type is None:
+                found_type = t
+            elif found_type != t:
+                raise ValueError(f"Conflicting return types: {found_type} vs {t}")
+    return found_type or "None"
+
+
+# For string assignment to fixed-size arrays
+
+
 def assign_string_to_array(builder, target_array_ptr, source_string_ptr, array_length):
     """
     Copy a string (i8*) to a fixed-size array ([N x i8]*)

pythonbpf/functions/return_utils.py

@@ -1,3 +1,10 @@
+"""
+Utility functions for handling return statements in BPF functions.
+
+Provides handlers for different types of returns including XDP actions,
+None returns, and standard returns.
+"""
+
 import logging
 import ast
 
@@ -14,19 +21,19 @@ XDP_ACTIONS = {
 }
 
 
-def handle_none_return(builder) -> bool:
+def _handle_none_return(builder) -> bool:
     """Handle return or return None -> returns 0."""
     builder.ret(ir.Constant(ir.IntType(64), 0))
     logger.debug("Generated default return: 0")
     return True
 
 
-def is_xdp_name(name: str) -> bool:
+def _is_xdp_name(name: str) -> bool:
     """Check if a name is an XDP action"""
     return name in XDP_ACTIONS
 
 
-def handle_xdp_return(stmt: ast.Return, builder, ret_type) -> bool:
+def _handle_xdp_return(stmt: ast.Return, builder, ret_type) -> bool:
     """Handle XDP returns"""
     if not isinstance(stmt.value, ast.Name):
         return False
@@ -37,6 +44,7 @@ def handle_xdp_return(stmt: ast.Return, builder, ret_type) -> bool:
         raise ValueError(
             f"Unknown XDP action: {action_name}. Available: {XDP_ACTIONS.keys()}"
         )
+        return False
 
     value = XDP_ACTIONS[action_name]
     builder.ret(ir.Constant(ret_type, value))

pythonbpf/globals_pass.py

@@ -1,3 +1,10 @@
+"""
+Global variables and compiler metadata processing.
+
+This module handles BPF global variables and emits the @llvm.compiler.used
+metadata to prevent LLVM from optimizing away important symbols.
+"""
+
 from llvmlite import ir
 import ast
 
@@ -12,6 +19,16 @@ global_sym_tab = []
 
 
 def populate_global_symbol_table(tree, module: ir.Module):
+    """
+    Populate the global symbol table with BPF functions, maps, and globals.
+
+    Args:
+        tree: The Python AST to scan for global symbols
+        module: The LLVM IR module (not used in current implementation)
+
+    Returns:
+        False (legacy return value)
+    """
     for node in tree.body:
         if isinstance(node, ast.FunctionDef):
             for dec in node.decorator_list:
@@ -33,6 +50,17 @@ def populate_global_symbol_table(tree, module: ir.Module):
 
 
 def emit_global(module: ir.Module, node, name):
+    """
+    Emit a BPF global variable into the LLVM IR module.
+
+    Args:
+        module: The LLVM IR module to add the global variable to
+        node: The AST function node containing the global definition
+        name: The name of the global variable
+
+    Returns:
+        The created global variable
+    """
     logger.info(f"global identifier {name} processing")
     # deduce LLVM type from the annotated return
     if not isinstance(node.returns, ast.Name):
@@ -117,7 +145,11 @@ def globals_processing(tree, module):
 
 def emit_llvm_compiler_used(module: ir.Module, names: list[str]):
     """
-    Emit the @llvm.compiler.used global given a list of function/global names.
+    Emit the @llvm.compiler.used global to prevent LLVM from optimizing away symbols.
+
+    Args:
+        module: The LLVM IR module to add the compiler.used metadata to
+        names: List of function/global names that must be preserved
     """
     ptr_ty = ir.PointerType()
     used_array_ty = ir.ArrayType(ptr_ty, len(names))
@@ -138,6 +170,13 @@ def emit_llvm_compiler_used(module: ir.Module, names: list[str]):
 
 
 def globals_list_creation(tree, module: ir.Module):
+    """
+    Collect all BPF symbols and emit @llvm.compiler.used metadata.
+
+    Args:
+        tree: The Python AST to scan for symbols
+        module: The LLVM IR module to add metadata to
+    """
     collected = ["LICENSE"]
 
     for node in tree.body:

pythonbpf/helper/__init__.py

@@ -1,63 +1,11 @@
-from .helper_registry import HelperHandlerRegistry
-from .helper_utils import reset_scratch_pool
+"""BPF helper functions and handlers."""
+
+from .helper_utils import HelperHandlerRegistry
 from .bpf_helper_handler import handle_helper_call
 from .helpers import ktime, pid, deref, XDP_DROP, XDP_PASS
 
-
-# Register the helper handler with expr module
-def _register_helper_handler():
-    """Register helper call handler with the expression evaluator"""
-    from pythonbpf.expr.expr_pass import CallHandlerRegistry
-
-    def helper_call_handler(
-        call, module, builder, func, local_sym_tab, map_sym_tab, structs_sym_tab
-    ):
-        """Check if call is a helper and handle it"""
-        import ast
-
-        # Check for direct helper calls (e.g., ktime(), print())
-        if isinstance(call.func, ast.Name):
-            if HelperHandlerRegistry.has_handler(call.func.id):
-                return handle_helper_call(
-                    call,
-                    module,
-                    builder,
-                    func,
-                    local_sym_tab,
-                    map_sym_tab,
-                    structs_sym_tab,
-                )
-
-        # Check for method calls (e.g., map.lookup())
-        elif isinstance(call.func, ast.Attribute):
-            method_name = call.func.attr
-
-            # Handle: my_map.lookup(key)
-            if isinstance(call.func.value, ast.Name):
-                obj_name = call.func.value.id
-                if map_sym_tab and obj_name in map_sym_tab:
-                    if HelperHandlerRegistry.has_handler(method_name):
-                        return handle_helper_call(
-                            call,
-                            module,
-                            builder,
-                            func,
-                            local_sym_tab,
-                            map_sym_tab,
-                            structs_sym_tab,
-                        )
-
-        return None
-
-    CallHandlerRegistry.set_handler(helper_call_handler)
-
-
-# Register on module import
-_register_helper_handler()
-
 __all__ = [
     "HelperHandlerRegistry",
-    "reset_scratch_pool",
     "handle_helper_call",
     "ktime",
     "pid",

pythonbpf/helper/bpf_helper_handler.py

@@ -1,15 +1,22 @@
+"""
+BPF helper function handlers for LLVM IR emission.
+
+This module provides handlers for various BPF helper functions, emitting
+the appropriate LLVM IR to call kernel BPF helpers like map operations,
+printing, time functions, etc.
+"""
+
 import ast
 from llvmlite import ir
 from enum import Enum
-
-from .helper_registry import HelperHandlerRegistry
 from .helper_utils import (
+    HelperHandlerRegistry,
     get_or_create_ptr_from_arg,
     get_flags_val,
+    handle_fstring_print,
+    simple_string_print,
     get_data_ptr_and_size,
 )
-from .printk_formatter import simple_string_print, handle_fstring_print
-
 from logging import Logger
 import logging
 
@@ -17,6 +24,8 @@ logger: Logger = logging.getLogger(__name__)
 
 
 class BPFHelperID(Enum):
+    """Enumeration of BPF helper function IDs."""
+
     BPF_MAP_LOOKUP_ELEM = 1
     BPF_MAP_UPDATE_ELEM = 2
     BPF_MAP_DELETE_ELEM = 3
@@ -35,7 +44,6 @@ def bpf_ktime_get_ns_emitter(
     func,
     local_sym_tab=None,
     struct_sym_tab=None,
-    map_sym_tab=None,
 ):
     """
     Emit LLVM IR for bpf_ktime_get_ns helper function call.
@@ -58,7 +66,6 @@ def bpf_map_lookup_elem_emitter(
     func,
     local_sym_tab=None,
     struct_sym_tab=None,
-    map_sym_tab=None,
 ):
     """
     Emit LLVM IR for bpf_map_lookup_elem helper function call.
@@ -67,17 +74,11 @@ def bpf_map_lookup_elem_emitter(
         raise ValueError(
             f"Map lookup expects exactly one argument (key), got {len(call.args)}"
         )
-    key_ptr = get_or_create_ptr_from_arg(
-        func, module, call.args[0], builder, local_sym_tab, map_sym_tab, struct_sym_tab
-    )
+    key_ptr = get_or_create_ptr_from_arg(call.args[0], builder, local_sym_tab)
     map_void_ptr = builder.bitcast(map_ptr, ir.PointerType())
 
-    # TODO: I have changed the return type to i64*, as we are
-    # allocating space for that type in allocate_mem. This is
-    # temporary, and we will honour other widths later. But this
-    # allows us to have cool binary ops on the returned value.
     fn_type = ir.FunctionType(
-        ir.PointerType(ir.IntType(64)),  # Return type: void*
+        ir.PointerType(),  # Return type: void*
         [ir.PointerType(), ir.PointerType()],  # Args: (void*, void*)
         var_arg=False,
     )
@@ -100,7 +101,6 @@ def bpf_printk_emitter(
     func,
     local_sym_tab=None,
     struct_sym_tab=None,
-    map_sym_tab=None,
 ):
     """Emit LLVM IR for bpf_printk helper function call."""
     if not hasattr(func, "_fmt_counter"):
@@ -136,7 +136,7 @@ def bpf_printk_emitter(
     fn_ptr = builder.inttoptr(fn_addr, fn_ptr_type)
 
     builder.call(fn_ptr, args, tail=True)
-    return True
+    return None
 
 
 @HelperHandlerRegistry.register("update")
@@ -148,7 +148,6 @@ def bpf_map_update_elem_emitter(
     func,
     local_sym_tab=None,
     struct_sym_tab=None,
-    map_sym_tab=None,
 ):
     """
     Emit LLVM IR for bpf_map_update_elem helper function call.
@@ -163,12 +162,8 @@ def bpf_map_update_elem_emitter(
     value_arg = call.args[1]
     flags_arg = call.args[2] if len(call.args) > 2 else None
 
-    key_ptr = get_or_create_ptr_from_arg(
-        func, module, key_arg, builder, local_sym_tab, map_sym_tab, struct_sym_tab
-    )
-    value_ptr = get_or_create_ptr_from_arg(
-        func, module, value_arg, builder, local_sym_tab, map_sym_tab, struct_sym_tab
-    )
+    key_ptr = get_or_create_ptr_from_arg(key_arg, builder, local_sym_tab)
+    value_ptr = get_or_create_ptr_from_arg(value_arg, builder, local_sym_tab)
     flags_val = get_flags_val(flags_arg, builder, local_sym_tab)
 
     map_void_ptr = builder.bitcast(map_ptr, ir.PointerType())
@@ -203,7 +198,6 @@ def bpf_map_delete_elem_emitter(
     func,
     local_sym_tab=None,
     struct_sym_tab=None,
-    map_sym_tab=None,
 ):
     """
     Emit LLVM IR for bpf_map_delete_elem helper function call.
@@ -213,9 +207,7 @@ def bpf_map_delete_elem_emitter(
         raise ValueError(
             f"Map delete expects exactly one argument (key), got {len(call.args)}"
         )
-    key_ptr = get_or_create_ptr_from_arg(
-        func, module, call.args[0], builder, local_sym_tab, map_sym_tab, struct_sym_tab
-    )
+    key_ptr = get_or_create_ptr_from_arg(call.args[0], builder, local_sym_tab)
     map_void_ptr = builder.bitcast(map_ptr, ir.PointerType())
 
     # Define function type for bpf_map_delete_elem
@@ -243,7 +235,6 @@ def bpf_get_current_pid_tgid_emitter(
     func,
     local_sym_tab=None,
     struct_sym_tab=None,
-    map_sym_tab=None,
 ):
     """
     Emit LLVM IR for bpf_get_current_pid_tgid helper function call.
@@ -270,8 +261,12 @@ def bpf_perf_event_output_handler(
     func,
     local_sym_tab=None,
     struct_sym_tab=None,
-    map_sym_tab=None,
 ):
+    """
+    Emit LLVM IR for bpf_perf_event_output helper function call.
+
+    This allows sending data to userspace via a perf event array.
+    """
     if len(call.args) != 1:
         raise ValueError(
             f"Perf event output expects exactly one argument, got {len(call.args)}"
@@ -322,6 +317,7 @@ def handle_helper_call(
 
     # Helper function to get map pointer and invoke handler
     def invoke_helper(method_name, map_ptr=None):
+        """Helper function to look up and invoke a registered handler."""
         handler = HelperHandlerRegistry.get_handler(method_name)
         if not handler:
             raise NotImplementedError(
@@ -335,7 +331,6 @@ def handle_helper_call(
             func,
             local_sym_tab,
             struct_sym_tab,
-            map_sym_tab,
         )
 
     # Handle direct function calls (e.g., print(), ktime())

pythonbpf/helper/helper_registry.py

@@ -1,27 +0,0 @@
-from typing import Callable
-
-
-class HelperHandlerRegistry:
-    """Registry for BPF helpers"""
-
-    _handlers: dict[str, Callable] = {}
-
-    @classmethod
-    def register(cls, helper_name):
-        """Decorator to register a handler function for a helper"""
-
-        def decorator(func):
-            cls._handlers[helper_name] = func
-            return func
-
-        return decorator
-
-    @classmethod
-    def get_handler(cls, helper_name):
-        """Get the handler function for a helper"""
-        return cls._handlers.get(helper_name)
-
-    @classmethod
-    def has_handler(cls, helper_name):
-        """Check if a handler function is registered for a helper"""
-        return helper_name in cls._handlers

pythonbpf/helper/helper_utils.py

@@ -1,101 +1,130 @@
+"""
+Utility functions for BPF helper function handling.
+
+This module provides utility functions for processing BPF helper function
+calls, including argument handling, string formatting for bpf_printk,
+and a registry for helper function handlers.
+"""
+
 import ast
 import logging
+from collections.abc import Callable
 
 from llvmlite import ir
-from pythonbpf.expr import (
-    get_operand_value,
-)
+from pythonbpf.expr import eval_expr
 
 logger = logging.getLogger(__name__)
 
 
-class ScratchPoolManager:
-    """Manage the temporary helper variables in local_sym_tab"""
+class HelperHandlerRegistry:
+    """Registry for BPF helpers"""
 
-    def __init__(self):
-        self._counter = 0
+    _handlers: dict[str, Callable] = {}
 
-    @property
-    def counter(self):
-        return self._counter
+    @classmethod
+    def register(cls, helper_name):
+        """Decorator to register a handler function for a helper"""
 
-    def reset(self):
-        self._counter = 0
-        logger.debug("Scratch pool counter reset to 0")
+        def decorator(func):
+            """Decorator that registers the handler function."""
+            cls._handlers[helper_name] = func
+            return func
 
-    def get_next_temp(self, local_sym_tab):
-        temp_name = f"__helper_temp_{self._counter}"
-        self._counter += 1
+        return decorator
 
-        if temp_name not in local_sym_tab:
-            raise ValueError(
-                f"Scratch pool exhausted or inadequate: {temp_name}. "
-                f"Current counter: {self._counter}"
-            )
+    @classmethod
+    def get_handler(cls, helper_name):
+        """Get the handler function for a helper"""
+        return cls._handlers.get(helper_name)
 
-        return local_sym_tab[temp_name].var, temp_name
-
-
-_temp_pool_manager = ScratchPoolManager()  # Singleton instance
-
-
-def reset_scratch_pool():
-    """Reset the scratch pool counter"""
-    _temp_pool_manager.reset()
-
-
-# ============================================================================
-# Argument Preparation
-# ============================================================================
+    @classmethod
+    def has_handler(cls, helper_name):
+        """Check if a handler function is registered for a helper"""
+        return helper_name in cls._handlers
 
 
 def get_var_ptr_from_name(var_name, local_sym_tab):
-    """Get a pointer to a variable from the symbol table."""
+    """
+    Get a pointer to a variable from the symbol table.
+
+    Args:
+        var_name: Name of the variable to look up
+        local_sym_tab: Local symbol table
+
+    Returns:
+        Pointer to the variable
+
+    Raises:
+        ValueError: If the variable is not found
+    """
     if local_sym_tab and var_name in local_sym_tab:
         return local_sym_tab[var_name].var
     raise ValueError(f"Variable '{var_name}' not found in local symbol table")
 
 
-def create_int_constant_ptr(value, builder, local_sym_tab, int_width=64):
-    """Create a pointer to an integer constant."""
+def create_int_constant_ptr(value, builder, int_width=64):
+    """
+    Create a pointer to an integer constant.
 
+    Args:
+        value: The integer value
+        builder: LLVM IR builder
+        int_width: Width of the integer in bits (default: 64)
+
+    Returns:
+        Pointer to the allocated integer constant
+    """
     # Default to 64-bit integer
-    ptr, temp_name = _temp_pool_manager.get_next_temp(local_sym_tab)
-    logger.info(f"Using temp variable '{temp_name}' for int constant {value}")
-    const_val = ir.Constant(ir.IntType(int_width), value)
-    builder.store(const_val, ptr)
+    int_type = ir.IntType(int_width)
+    ptr = builder.alloca(int_type)
+    ptr.align = int_type.width // 8
+    builder.store(ir.Constant(int_type, value), ptr)
     return ptr
 
 
-def get_or_create_ptr_from_arg(
-    func, module, arg, builder, local_sym_tab, map_sym_tab, struct_sym_tab=None
-):
-    """Extract or create pointer from the call arguments."""
+def get_or_create_ptr_from_arg(arg, builder, local_sym_tab):
+    """
+    Extract or create pointer from call arguments.
+
+    Args:
+        arg: The AST argument node
+        builder: LLVM IR builder
+        local_sym_tab: Local symbol table
+
+    Returns:
+        Pointer to the argument value
+
+    Raises:
+        NotImplementedError: If the argument type is not supported
+    """
 
     if isinstance(arg, ast.Name):
         ptr = get_var_ptr_from_name(arg.id, local_sym_tab)
     elif isinstance(arg, ast.Constant) and isinstance(arg.value, int):
-        ptr = create_int_constant_ptr(arg.value, builder, local_sym_tab)
+        ptr = create_int_constant_ptr(arg.value, builder)
     else:
-        # Evaluate the expression and store the result in a temp variable
-        val = get_operand_value(
-            func, module, arg, builder, local_sym_tab, map_sym_tab, struct_sym_tab
+        raise NotImplementedError(
+            "Only simple variable names are supported as args in map helpers."
         )
-        if val is None:
-            raise ValueError("Failed to evaluate expression for helper arg.")
-
-        # NOTE: We assume the result is an int64 for now
-        # if isinstance(arg, ast.Attribute):
-        # return val
-        ptr, temp_name = _temp_pool_manager.get_next_temp(local_sym_tab)
-        logger.info(f"Using temp variable '{temp_name}' for expression result")
-        builder.store(val, ptr)
-
     return ptr
 
 
 def get_flags_val(arg, builder, local_sym_tab):
-    """Extract or create flags value from the call arguments."""
+    """
+    Extract or create flags value from call arguments.
+
+    Args:
+        arg: The AST argument node for flags
+        builder: LLVM IR builder
+        local_sym_tab: Local symbol table
+
+    Returns:
+        Integer flags value or LLVM IR value
+
+    Raises:
+        ValueError: If a variable is not found in symbol table
+        NotImplementedError: If the argument type is not supported
+    """
     if not arg:
         return 0
 
@@ -113,6 +142,231 @@ def get_flags_val(arg, builder, local_sym_tab):
     )
 
 
+def simple_string_print(string_value, module, builder, func):
+    """
+    Prepare arguments for bpf_printk from a simple string value.
+
+    Args:
+        string_value: The string to print
+        module: LLVM IR module
+        builder: LLVM IR builder
+        func: The LLVM IR function being built
+
+    Returns:
+        List of arguments for bpf_printk
+    """
+    fmt_str = string_value + "\n\0"
+    fmt_ptr = _create_format_string_global(fmt_str, func, module, builder)
+
+    args = [fmt_ptr, ir.Constant(ir.IntType(32), len(fmt_str))]
+    return args
+
+
+def handle_fstring_print(
+    joined_str,
+    module,
+    builder,
+    func,
+    local_sym_tab=None,
+    struct_sym_tab=None,
+):
+    """
+    Handle f-string formatting for bpf_printk emitter.
+
+    Args:
+        joined_str: AST JoinedStr node representing the f-string
+        module: LLVM IR module
+        builder: LLVM IR builder
+        func: The LLVM IR function being built
+        local_sym_tab: Local symbol table
+        struct_sym_tab: Struct symbol table
+
+    Returns:
+        List of arguments for bpf_printk
+
+    Raises:
+        NotImplementedError: If f-string contains unsupported value types
+    """
+    fmt_parts = []
+    exprs = []
+
+    for value in joined_str.values:
+        logger.debug(f"Processing f-string value: {ast.dump(value)}")
+
+        if isinstance(value, ast.Constant):
+            _process_constant_in_fstring(value, fmt_parts, exprs)
+        elif isinstance(value, ast.FormattedValue):
+            _process_fval(
+                value,
+                fmt_parts,
+                exprs,
+                local_sym_tab,
+                struct_sym_tab,
+            )
+        else:
+            raise NotImplementedError(f"Unsupported f-string value type: {type(value)}")
+
+    fmt_str = "".join(fmt_parts)
+    args = simple_string_print(fmt_str, module, builder, func)
+
+    # NOTE: Process expressions (limited to 3 due to BPF constraints)
+    if len(exprs) > 3:
+        logger.warning("bpf_printk supports up to 3 args, extra args will be ignored.")
+
+    for expr in exprs[:3]:
+        arg_value = _prepare_expr_args(
+            expr,
+            func,
+            module,
+            builder,
+            local_sym_tab,
+            struct_sym_tab,
+        )
+        args.append(arg_value)
+
+    return args
+
+
+def _process_constant_in_fstring(cst, fmt_parts, exprs):
+    """Process constant values in f-string."""
+    if isinstance(cst.value, str):
+        fmt_parts.append(cst.value)
+    elif isinstance(cst.value, int):
+        fmt_parts.append("%lld")
+        exprs.append(ir.Constant(ir.IntType(64), cst.value))
+    else:
+        raise NotImplementedError(
+            f"Unsupported constant type in f-string: {type(cst.value)}"
+        )
+
+
+def _process_fval(fval, fmt_parts, exprs, local_sym_tab, struct_sym_tab):
+    """Process formatted values in f-string."""
+    logger.debug(f"Processing formatted value: {ast.dump(fval)}")
+
+    if isinstance(fval.value, ast.Name):
+        _process_name_in_fval(fval.value, fmt_parts, exprs, local_sym_tab)
+    elif isinstance(fval.value, ast.Attribute):
+        _process_attr_in_fval(
+            fval.value,
+            fmt_parts,
+            exprs,
+            local_sym_tab,
+            struct_sym_tab,
+        )
+    else:
+        raise NotImplementedError(
+            f"Unsupported formatted value in f-string: {type(fval.value)}"
+        )
+
+
+def _process_name_in_fval(name_node, fmt_parts, exprs, local_sym_tab):
+    """Process name nodes in formatted values."""
+    if local_sym_tab and name_node.id in local_sym_tab:
+        _, var_type, tmp = local_sym_tab[name_node.id]
+        _populate_fval(var_type, name_node, fmt_parts, exprs)
+
+
+def _process_attr_in_fval(attr_node, fmt_parts, exprs, local_sym_tab, struct_sym_tab):
+    """Process attribute nodes in formatted values."""
+    if (
+        isinstance(attr_node.value, ast.Name)
+        and local_sym_tab
+        and attr_node.value.id in local_sym_tab
+    ):
+        var_name = attr_node.value.id
+        field_name = attr_node.attr
+
+        var_type = local_sym_tab[var_name].metadata
+        if var_type not in struct_sym_tab:
+            raise ValueError(
+                f"Struct '{var_type}' for '{var_name}' not in symbol table"
+            )
+
+        struct_info = struct_sym_tab[var_type]
+        if field_name not in struct_info.fields:
+            raise ValueError(f"Field '{field_name}' not found in struct '{var_type}'")
+
+        field_type = struct_info.field_type(field_name)
+        _populate_fval(field_type, attr_node, fmt_parts, exprs)
+    else:
+        raise NotImplementedError(
+            "Only simple attribute on local vars is supported in f-strings."
+        )
+
+
+def _populate_fval(ftype, node, fmt_parts, exprs):
+    """Populate format parts and expressions based on field type."""
+    if isinstance(ftype, ir.IntType):
+        # TODO: We print as signed integers only for now
+        if ftype.width == 64:
+            fmt_parts.append("%lld")
+            exprs.append(node)
+        elif ftype.width == 32:
+            fmt_parts.append("%d")
+            exprs.append(node)
+        else:
+            raise NotImplementedError(
+                f"Unsupported integer width in f-string: {ftype.width}"
+            )
+    elif ftype == ir.PointerType(ir.IntType(8)):
+        # NOTE: We assume i8* is a string
+        fmt_parts.append("%s")
+        exprs.append(node)
+    else:
+        raise NotImplementedError(f"Unsupported field type in f-string: {ftype}")
+
+
+def _create_format_string_global(fmt_str, func, module, builder):
+    """Create a global variable for the format string."""
+    fmt_name = f"{func.name}____fmt{func._fmt_counter}"
+    func._fmt_counter += 1
+
+    fmt_gvar = ir.GlobalVariable(
+        module, ir.ArrayType(ir.IntType(8), len(fmt_str)), name=fmt_name
+    )
+    fmt_gvar.global_constant = True
+    fmt_gvar.initializer = ir.Constant(
+        ir.ArrayType(ir.IntType(8), len(fmt_str)), bytearray(fmt_str.encode("utf8"))
+    )
+    fmt_gvar.linkage = "internal"
+    fmt_gvar.align = 1
+
+    return builder.bitcast(fmt_gvar, ir.PointerType())
+
+
+def _prepare_expr_args(expr, func, module, builder, local_sym_tab, struct_sym_tab):
+    """Evaluate and prepare an expression to use as an arg for bpf_printk."""
+    val, _ = eval_expr(
+        func,
+        module,
+        builder,
+        expr,
+        local_sym_tab,
+        None,
+        struct_sym_tab,
+    )
+
+    if val:
+        if isinstance(val.type, ir.PointerType):
+            val = builder.ptrtoint(val, ir.IntType(64))
+        elif isinstance(val.type, ir.IntType):
+            if val.type.width < 64:
+                val = builder.sext(val, ir.IntType(64))
+        else:
+            logger.warning(
+                "Only int and ptr supported in bpf_printk args. Others default to 0."
+            )
+            val = ir.Constant(ir.IntType(64), 0)
+        return val
+    else:
+        logger.warning(
+            "Failed to evaluate expression for bpf_printk argument. "
+            "It will be converted to 0."
+        )
+        return ir.Constant(ir.IntType(64), 0)
+
+
 def get_data_ptr_and_size(data_arg, local_sym_tab, struct_sym_tab):
     """Extract data pointer and size information for perf event output."""
     if isinstance(data_arg, ast.Name):

pythonbpf/helper/helpers.py

@@ -1,11 +1,31 @@
+"""
+BPF helper function stubs for Python type hints.
+
+This module provides Python stub functions that represent BPF helper functions.
+These stubs are used for type checking and will be replaced with actual BPF
+helper calls during compilation.
+"""
+
 import ctypes
 
 
 def ktime():
+    """
+    Get the current kernel time in nanoseconds.
+
+    Returns:
+        A c_int64 stub value (actual implementation is in BPF runtime)
+    """
     return ctypes.c_int64(0)
 
 
 def pid():
+    """
+    Get the current process ID (PID).
+
+    Returns:
+        A c_int32 stub value (actual implementation is in BPF runtime)
+    """
     return ctypes.c_int32(0)
 
 
@@ -15,8 +35,5 @@ def deref(ptr):
     return result if result is not None else 0
 
 
-XDP_ABORTED = ctypes.c_int64(0)
 XDP_DROP = ctypes.c_int64(1)
 XDP_PASS = ctypes.c_int64(2)
-XDP_TX = ctypes.c_int64(3)
-XDP_REDIRECT = ctypes.c_int64(4)

pythonbpf/helper/printk_formatter.py

@@ -1,240 +0,0 @@
-import ast
-import logging
-
-from llvmlite import ir
-from pythonbpf.expr import eval_expr, get_base_type_and_depth, deref_to_depth
-
-logger = logging.getLogger(__name__)
-
-
-def simple_string_print(string_value, module, builder, func):
-    """Prepare arguments for bpf_printk from a simple string value"""
-    fmt_str = string_value + "\n\0"
-    fmt_ptr = _create_format_string_global(fmt_str, func, module, builder)
-
-    args = [fmt_ptr, ir.Constant(ir.IntType(32), len(fmt_str))]
-    return args
-
-
-def handle_fstring_print(
-    joined_str,
-    module,
-    builder,
-    func,
-    local_sym_tab=None,
-    struct_sym_tab=None,
-):
-    """Handle f-string formatting for bpf_printk emitter."""
-    fmt_parts = []
-    exprs = []
-
-    for value in joined_str.values:
-        logger.debug(f"Processing f-string value: {ast.dump(value)}")
-
-        if isinstance(value, ast.Constant):
-            _process_constant_in_fstring(value, fmt_parts, exprs)
-        elif isinstance(value, ast.FormattedValue):
-            _process_fval(
-                value,
-                fmt_parts,
-                exprs,
-                local_sym_tab,
-                struct_sym_tab,
-            )
-        else:
-            raise NotImplementedError(f"Unsupported f-string value type: {type(value)}")
-
-    fmt_str = "".join(fmt_parts)
-    args = simple_string_print(fmt_str, module, builder, func)
-
-    # NOTE: Process expressions (limited to 3 due to BPF constraints)
-    if len(exprs) > 3:
-        logger.warning("bpf_printk supports up to 3 args, extra args will be ignored.")
-
-    for expr in exprs[:3]:
-        arg_value = _prepare_expr_args(
-            expr,
-            func,
-            module,
-            builder,
-            local_sym_tab,
-            struct_sym_tab,
-        )
-        args.append(arg_value)
-
-    return args
-
-
-# ============================================================================
-# Internal Helpers
-# ============================================================================
-
-
-def _process_constant_in_fstring(cst, fmt_parts, exprs):
-    """Process constant values in f-string."""
-    if isinstance(cst.value, str):
-        fmt_parts.append(cst.value)
-    elif isinstance(cst.value, int):
-        fmt_parts.append("%lld")
-        exprs.append(ir.Constant(ir.IntType(64), cst.value))
-    else:
-        raise NotImplementedError(
-            f"Unsupported constant type in f-string: {type(cst.value)}"
-        )
-
-
-def _process_fval(fval, fmt_parts, exprs, local_sym_tab, struct_sym_tab):
-    """Process formatted values in f-string."""
-    logger.debug(f"Processing formatted value: {ast.dump(fval)}")
-
-    if isinstance(fval.value, ast.Name):
-        _process_name_in_fval(fval.value, fmt_parts, exprs, local_sym_tab)
-    elif isinstance(fval.value, ast.Attribute):
-        _process_attr_in_fval(
-            fval.value,
-            fmt_parts,
-            exprs,
-            local_sym_tab,
-            struct_sym_tab,
-        )
-    else:
-        raise NotImplementedError(
-            f"Unsupported formatted value in f-string: {type(fval.value)}"
-        )
-
-
-def _process_name_in_fval(name_node, fmt_parts, exprs, local_sym_tab):
-    """Process name nodes in formatted values."""
-    if local_sym_tab and name_node.id in local_sym_tab:
-        _, var_type, tmp = local_sym_tab[name_node.id]
-        _populate_fval(var_type, name_node, fmt_parts, exprs)
-
-
-def _process_attr_in_fval(attr_node, fmt_parts, exprs, local_sym_tab, struct_sym_tab):
-    """Process attribute nodes in formatted values."""
-    if (
-        isinstance(attr_node.value, ast.Name)
-        and local_sym_tab
-        and attr_node.value.id in local_sym_tab
-    ):
-        var_name = attr_node.value.id
-        field_name = attr_node.attr
-
-        var_type = local_sym_tab[var_name].metadata
-        if var_type not in struct_sym_tab:
-            raise ValueError(
-                f"Struct '{var_type}' for '{var_name}' not in symbol table"
-            )
-
-        struct_info = struct_sym_tab[var_type]
-        if field_name not in struct_info.fields:
-            raise ValueError(f"Field '{field_name}' not found in struct '{var_type}'")
-
-        field_type = struct_info.field_type(field_name)
-        _populate_fval(field_type, attr_node, fmt_parts, exprs)
-    else:
-        raise NotImplementedError(
-            "Only simple attribute on local vars is supported in f-strings."
-        )
-
-
-def _populate_fval(ftype, node, fmt_parts, exprs):
-    """Populate format parts and expressions based on field type."""
-    if isinstance(ftype, ir.IntType):
-        # TODO: We print as signed integers only for now
-        if ftype.width == 64:
-            fmt_parts.append("%lld")
-            exprs.append(node)
-        elif ftype.width == 32:
-            fmt_parts.append("%d")
-            exprs.append(node)
-        else:
-            raise NotImplementedError(
-                f"Unsupported integer width in f-string: {ftype.width}"
-            )
-    elif isinstance(ftype, ir.PointerType):
-        target, depth = get_base_type_and_depth(ftype)
-        if isinstance(target, ir.IntType):
-            if target.width == 64:
-                fmt_parts.append("%lld")
-                exprs.append(node)
-            elif target.width == 32:
-                fmt_parts.append("%d")
-                exprs.append(node)
-            elif target.width == 8 and depth == 1:
-                # NOTE: Assume i8* is a string
-                fmt_parts.append("%s")
-                exprs.append(node)
-            else:
-                raise NotImplementedError(
-                    f"Unsupported pointer target type in f-string: {target}"
-                )
-        else:
-            raise NotImplementedError(
-                f"Unsupported pointer target type in f-string: {target}"
-            )
-    else:
-        raise NotImplementedError(f"Unsupported field type in f-string: {ftype}")
-
-
-def _create_format_string_global(fmt_str, func, module, builder):
-    """Create a global variable for the format string."""
-    fmt_name = f"{func.name}____fmt{func._fmt_counter}"
-    func._fmt_counter += 1
-
-    fmt_gvar = ir.GlobalVariable(
-        module, ir.ArrayType(ir.IntType(8), len(fmt_str)), name=fmt_name
-    )
-    fmt_gvar.global_constant = True
-    fmt_gvar.initializer = ir.Constant(
-        ir.ArrayType(ir.IntType(8), len(fmt_str)), bytearray(fmt_str.encode("utf8"))
-    )
-    fmt_gvar.linkage = "internal"
-    fmt_gvar.align = 1
-
-    return builder.bitcast(fmt_gvar, ir.PointerType())
-
-
-def _prepare_expr_args(expr, func, module, builder, local_sym_tab, struct_sym_tab):
-    """Evaluate and prepare an expression to use as an arg for bpf_printk."""
-    val, _ = eval_expr(
-        func,
-        module,
-        builder,
-        expr,
-        local_sym_tab,
-        None,
-        struct_sym_tab,
-    )
-
-    if val:
-        if isinstance(val.type, ir.PointerType):
-            target, depth = get_base_type_and_depth(val.type)
-            if isinstance(target, ir.IntType):
-                if target.width >= 32:
-                    val = deref_to_depth(func, builder, val, depth)
-                    val = builder.sext(val, ir.IntType(64))
-                elif target.width == 8 and depth == 1:
-                    # NOTE: i8* is string, no need to deref
-                    pass
-
-            else:
-                logger.warning(
-                    "Only int and ptr supported in bpf_printk args. Others default to 0."
-                )
-                val = ir.Constant(ir.IntType(64), 0)
-        elif isinstance(val.type, ir.IntType):
-            if val.type.width < 64:
-                val = builder.sext(val, ir.IntType(64))
-        else:
-            logger.warning(
-                "Only int and ptr supported in bpf_printk args. Others default to 0."
-            )
-            val = ir.Constant(ir.IntType(64), 0)
-        return val
-    else:
-        logger.warning(
-            "Failed to evaluate expression for bpf_printk argument. "
-            "It will be converted to 0."
-        )
-        return ir.Constant(ir.IntType(64), 0)

pythonbpf/license_pass.py

@@ -1,3 +1,10 @@
+"""
+LICENSE global variable processing for BPF programs.
+
+This module handles the processing of the LICENSE function which is required
+for BPF programs to declare their license (typically "GPL").
+"""
+
 from llvmlite import ir
 import ast
 from logging import Logger
@@ -7,6 +14,16 @@ logger: Logger = logging.getLogger(__name__)
 
 
 def emit_license(module: ir.Module, license_str: str):
+    """
+    Emit a LICENSE global variable into the LLVM IR module.
+
+    Args:
+        module: The LLVM IR module to add the LICENSE variable to
+        license_str: The license string (e.g., 'GPL')
+
+    Returns:
+        The created global variable
+    """
     license_bytes = license_str.encode("utf8") + b"\x00"
     elems = [ir.Constant(ir.IntType(8), b) for b in license_bytes]
     ty = ir.ArrayType(ir.IntType(8), len(elems))

pythonbpf/maps/__init__.py

@@ -1,3 +1,5 @@
+"""BPF map types and processing."""
+
 from .maps import HashMap, PerfEventArray, RingBuf
 from .maps_pass import maps_proc
 

pythonbpf/maps/map_debug_info.py

@@ -1,93 +0,0 @@
-from pythonbpf.debuginfo import DebugInfoGenerator
-from .map_types import BPFMapType
-
-
-def create_map_debug_info(module, map_global, map_name, map_params):
-    """Generate debug info metadata for BPF maps HASH and PERF_EVENT_ARRAY"""
-    generator = DebugInfoGenerator(module)
-
-    uint_type = generator.get_uint32_type()
-    ulong_type = generator.get_uint64_type()
-    array_type = generator.create_array_type(
-        uint_type, map_params.get("type", BPFMapType.UNSPEC).value
-    )
-    type_ptr = generator.create_pointer_type(array_type, 64)
-    key_ptr = generator.create_pointer_type(
-        array_type if "key_size" in map_params else ulong_type, 64
-    )
-    value_ptr = generator.create_pointer_type(
-        array_type if "value_size" in map_params else ulong_type, 64
-    )
-
-    elements_arr = []
-
-    # Create struct members
-    # scope field does not appear for some reason
-    cnt = 0
-    for elem in map_params:
-        if elem == "max_entries":
-            continue
-        if elem == "type":
-            ptr = type_ptr
-        elif "key" in elem:
-            ptr = key_ptr
-        else:
-            ptr = value_ptr
-        # TODO: the best way to do this is not 64, but get the size each time. this will not work for structs.
-        member = generator.create_struct_member(elem, ptr, cnt * 64)
-        elements_arr.append(member)
-        cnt += 1
-
-    if "max_entries" in map_params:
-        max_entries_array = generator.create_array_type(
-            uint_type, map_params["max_entries"]
-        )
-        max_entries_ptr = generator.create_pointer_type(max_entries_array, 64)
-        max_entries_member = generator.create_struct_member(
-            "max_entries", max_entries_ptr, cnt * 64
-        )
-        elements_arr.append(max_entries_member)
-
-    # Create the struct type
-    struct_type = generator.create_struct_type(
-        elements_arr, 64 * len(elements_arr), is_distinct=True
-    )
-
-    # Create global variable debug info
-    global_var = generator.create_global_var_debug_info(
-        map_name, struct_type, is_local=False
-    )
-
-    # Attach debug info to the global variable
-    map_global.set_metadata("dbg", global_var)
-
-    return global_var
-
-
-def create_ringbuf_debug_info(module, map_global, map_name, map_params):
-    """Generate debug information metadata for BPF RINGBUF map"""
-    generator = DebugInfoGenerator(module)
-
-    int_type = generator.get_int32_type()
-
-    type_array = generator.create_array_type(
-        int_type, map_params.get("type", BPFMapType.RINGBUF).value
-    )
-    type_ptr = generator.create_pointer_type(type_array, 64)
-    type_member = generator.create_struct_member("type", type_ptr, 0)
-
-    max_entries_array = generator.create_array_type(int_type, map_params["max_entries"])
-    max_entries_ptr = generator.create_pointer_type(max_entries_array, 64)
-    max_entries_member = generator.create_struct_member(
-        "max_entries", max_entries_ptr, 64
-    )
-
-    elements_arr = [type_member, max_entries_member]
-
-    struct_type = generator.create_struct_type(elements_arr, 128, is_distinct=True)
-
-    global_var = generator.create_global_var_debug_info(
-        map_name, struct_type, is_local=False
-    )
-    map_global.set_metadata("dbg", global_var)
-    return global_var

pythonbpf/maps/map_types.py

@@ -1,39 +0,0 @@
-from enum import Enum
-
-
-class BPFMapType(Enum):
-    UNSPEC = 0
-    HASH = 1
-    ARRAY = 2
-    PROG_ARRAY = 3
-    PERF_EVENT_ARRAY = 4
-    PERCPU_HASH = 5
-    PERCPU_ARRAY = 6
-    STACK_TRACE = 7
-    CGROUP_ARRAY = 8
-    LRU_HASH = 9
-    LRU_PERCPU_HASH = 10
-    LPM_TRIE = 11
-    ARRAY_OF_MAPS = 12
-    HASH_OF_MAPS = 13
-    DEVMAP = 14
-    SOCKMAP = 15
-    CPUMAP = 16
-    XSKMAP = 17
-    SOCKHASH = 18
-    CGROUP_STORAGE_DEPRECATED = 19
-    CGROUP_STORAGE = 19
-    REUSEPORT_SOCKARRAY = 20
-    PERCPU_CGROUP_STORAGE_DEPRECATED = 21
-    PERCPU_CGROUP_STORAGE = 21
-    QUEUE = 22
-    STACK = 23
-    SK_STORAGE = 24
-    DEVMAP_HASH = 25
-    STRUCT_OPS = 26
-    RINGBUF = 27
-    INODE_STORAGE = 28
-    TASK_STORAGE = 29
-    BLOOM_FILTER = 30
-    USER_RINGBUF = 31
-    CGRP_STORAGE = 32

pythonbpf/maps/maps.py

@@ -1,18 +1,60 @@
+"""
+BPF map type definitions for Python type hints.
+
+This module provides Python classes that represent BPF map types.
+These are used for type checking and map definition; the actual BPF maps
+are generated as LLVM IR during compilation.
+"""
+
+
 # This file provides type  and function hints only and does not actually give any functionality.
 class HashMap:
+    """
+    A BPF hash map for storing key-value pairs.
+
+    This is a type hint class used during compilation. The actual BPF map
+    implementation is generated as LLVM IR.
+    """
+
     def __init__(self, key, value, max_entries):
+        """
+        Initialize a HashMap definition.
+
+        Args:
+            key: The ctypes type for keys (e.g., c_int64)
+            value: The ctypes type for values (e.g., c_int64)
+            max_entries: Maximum number of entries the map can hold
+        """
         self.key = key
         self.value = value
         self.max_entries = max_entries
         self.entries = {}
 
     def lookup(self, key):
+        """
+        Look up a value by key in the map.
+
+        Args:
+            key: The key to look up
+
+        Returns:
+            The value if found, None otherwise
+        """
         if key in self.entries:
             return self.entries[key]
         else:
             return None
 
     def delete(self, key):
+        """
+        Delete an entry from the map by key.
+
+        Args:
+            key: The key to delete
+
+        Raises:
+            KeyError: If the key is not found in the map
+        """
         if key in self.entries:
             del self.entries[key]
         else:
@@ -20,6 +62,17 @@ class HashMap:
 
     # TODO: define the flags that can be added
     def update(self, key, value, flags=None):
+        """
+        Update or insert a key-value pair in the map.
+
+        Args:
+            key: The key to update
+            value: The new value
+            flags: Optional flags for update behavior
+
+        Raises:
+            KeyError: If the key is not found in the map
+        """
         if key in self.entries:
             self.entries[key] = value
         else:
@@ -27,25 +80,76 @@ class HashMap:
 
 
 class PerfEventArray:
+    """
+    A BPF perf event array for sending data to userspace.
+
+    This is a type hint class used during compilation.
+    """
+
     def __init__(self, key_size, value_size):
+        """
+        Initialize a PerfEventArray definition.
+
+        Args:
+            key_size: The size/type for keys
+            value_size: The size/type for values
+        """
         self.key_type = key_size
         self.value_type = value_size
         self.entries = {}
 
     def output(self, data):
+        """
+        Output data to the perf event array.
+
+        Args:
+            data: The data to output
+        """
         pass  # Placeholder for output method
 
 
 class RingBuf:
+    """
+    A BPF ring buffer for efficient data transfer to userspace.
+
+    This is a type hint class used during compilation.
+    """
+
     def __init__(self, max_entries):
+        """
+        Initialize a RingBuf definition.
+
+        Args:
+            max_entries: Maximum number of entries the ring buffer can hold
+        """
         self.max_entries = max_entries
 
     def reserve(self, size: int, flags=0):
+        """
+        Reserve space in the ring buffer.
+
+        Args:
+            size: Size in bytes to reserve
+            flags: Optional reservation flags
+
+        Returns:
+            0 as a placeholder (actual implementation is in BPF runtime)
+
+        Raises:
+            ValueError: If size exceeds max_entries
+        """
         if size > self.max_entries:
             raise ValueError("size cannot be greater than set maximum entries")
         return 0
 
     def submit(self, data, flags=0):
+        """
+        Submit data to the ring buffer.
+
+        Args:
+            data: The data to submit
+            flags: Optional submission flags
+        """
         pass
 
     # add discard, output and also give names to flags and stuff

pythonbpf/maps/maps_pass.py

@@ -1,11 +1,17 @@
+"""
+BPF map processing and LLVM IR generation.
+
+This module handles the processing of BPF map definitions decorated with @map,
+converting them to appropriate LLVM IR global variables with BTF debug info.
+"""
+
 import ast
-import logging
 from logging import Logger
 from llvmlite import ir
-
+from enum import Enum
 from .maps_utils import MapProcessorRegistry
-from .map_types import BPFMapType
-from .map_debug_info import create_map_debug_info, create_ringbuf_debug_info
+from pythonbpf.debuginfo import DebugInfoGenerator
+import logging
 
 logger: Logger = logging.getLogger(__name__)
 
@@ -21,14 +27,73 @@ def maps_proc(tree, module, chunks):
 
 
 def is_map(func_node):
+    """
+    Check if a function node is decorated with @map.
+
+    Args:
+        func_node: The AST function node to check
+
+    Returns:
+        True if the function is decorated with @map, False otherwise
+    """
     return any(
         isinstance(decorator, ast.Name) and decorator.id == "map"
         for decorator in func_node.decorator_list
     )
 
 
+class BPFMapType(Enum):
+    """Enumeration of BPF map types."""
+
+    UNSPEC = 0
+    HASH = 1
+    ARRAY = 2
+    PROG_ARRAY = 3
+    PERF_EVENT_ARRAY = 4
+    PERCPU_HASH = 5
+    PERCPU_ARRAY = 6
+    STACK_TRACE = 7
+    CGROUP_ARRAY = 8
+    LRU_HASH = 9
+    LRU_PERCPU_HASH = 10
+    LPM_TRIE = 11
+    ARRAY_OF_MAPS = 12
+    HASH_OF_MAPS = 13
+    DEVMAP = 14
+    SOCKMAP = 15
+    CPUMAP = 16
+    XSKMAP = 17
+    SOCKHASH = 18
+    CGROUP_STORAGE_DEPRECATED = 19
+    CGROUP_STORAGE = 19
+    REUSEPORT_SOCKARRAY = 20
+    PERCPU_CGROUP_STORAGE_DEPRECATED = 21
+    PERCPU_CGROUP_STORAGE = 21
+    QUEUE = 22
+    STACK = 23
+    SK_STORAGE = 24
+    DEVMAP_HASH = 25
+    STRUCT_OPS = 26
+    RINGBUF = 27
+    INODE_STORAGE = 28
+    TASK_STORAGE = 29
+    BLOOM_FILTER = 30
+    USER_RINGBUF = 31
+    CGRP_STORAGE = 32
+
+
 def create_bpf_map(module, map_name, map_params):
-    """Create a BPF map in the module with given parameters and debug info"""
+    """
+    Create a BPF map in the module with given parameters and debug info.
+
+    Args:
+        module: The LLVM IR module to add the map to
+        map_name: The name of the BPF map
+        map_params: Dictionary of map parameters (type, key_size, value_size, max_entries)
+
+    Returns:
+        The created global variable representing the map
+    """
 
     # Create the anonymous struct type for BPF map
     map_struct_type = ir.LiteralStructType(
@@ -47,37 +112,114 @@ def create_bpf_map(module, map_name, map_params):
     return map_global
 
 
-def _parse_map_params(rval, expected_args=None):
-    """Parse map parameters from call arguments and keywords."""
+def create_map_debug_info(module, map_global, map_name, map_params):
+    """Generate debug info metadata for BPF maps HASH and PERF_EVENT_ARRAY"""
+    generator = DebugInfoGenerator(module)
 
-    params = {}
+    uint_type = generator.get_uint32_type()
+    ulong_type = generator.get_uint64_type()
+    array_type = generator.create_array_type(
+        uint_type, map_params.get("type", BPFMapType.UNSPEC).value
+    )
+    type_ptr = generator.create_pointer_type(array_type, 64)
+    key_ptr = generator.create_pointer_type(
+        array_type if "key_size" in map_params else ulong_type, 64
+    )
+    value_ptr = generator.create_pointer_type(
+        array_type if "value_size" in map_params else ulong_type, 64
+    )
 
-    # Parse positional arguments
-    if expected_args:
-        for i, arg_name in enumerate(expected_args):
-            if i < len(rval.args):
-                arg = rval.args[i]
-                if isinstance(arg, ast.Name):
-                    params[arg_name] = arg.id
-                elif isinstance(arg, ast.Constant):
-                    params[arg_name] = arg.value
+    elements_arr = []
 
-    # Parse keyword arguments (override positional)
-    for keyword in rval.keywords:
-        if isinstance(keyword.value, ast.Name):
-            params[keyword.arg] = keyword.value.id
-        elif isinstance(keyword.value, ast.Constant):
-            params[keyword.arg] = keyword.value.value
+    # Create struct members
+    # scope field does not appear for some reason
+    cnt = 0
+    for elem in map_params:
+        if elem == "max_entries":
+            continue
+        if elem == "type":
+            ptr = type_ptr
+        elif "key" in elem:
+            ptr = key_ptr
+        else:
+            ptr = value_ptr
+        # TODO: the best way to do this is not 64, but get the size each time. this will not work for structs.
+        member = generator.create_struct_member(elem, ptr, cnt * 64)
+        elements_arr.append(member)
+        cnt += 1
 
-    return params
+    if "max_entries" in map_params:
+        max_entries_array = generator.create_array_type(
+            uint_type, map_params["max_entries"]
+        )
+        max_entries_ptr = generator.create_pointer_type(max_entries_array, 64)
+        max_entries_member = generator.create_struct_member(
+            "max_entries", max_entries_ptr, cnt * 64
+        )
+        elements_arr.append(max_entries_member)
+
+    # Create the struct type
+    struct_type = generator.create_struct_type(
+        elements_arr, 64 * len(elements_arr), is_distinct=True
+    )
+
+    # Create global variable debug info
+    global_var = generator.create_global_var_debug_info(
+        map_name, struct_type, is_local=False
+    )
+
+    # Attach debug info to the global variable
+    map_global.set_metadata("dbg", global_var)
+
+    return global_var
+
+
+def create_ringbuf_debug_info(module, map_global, map_name, map_params):
+    """Generate debug information metadata for BPF RINGBUF map"""
+    generator = DebugInfoGenerator(module)
+
+    int_type = generator.get_int32_type()
+
+    type_array = generator.create_array_type(
+        int_type, map_params.get("type", BPFMapType.RINGBUF).value
+    )
+    type_ptr = generator.create_pointer_type(type_array, 64)
+    type_member = generator.create_struct_member("type", type_ptr, 0)
+
+    max_entries_array = generator.create_array_type(int_type, map_params["max_entries"])
+    max_entries_ptr = generator.create_pointer_type(max_entries_array, 64)
+    max_entries_member = generator.create_struct_member(
+        "max_entries", max_entries_ptr, 64
+    )
+
+    elements_arr = [type_member, max_entries_member]
+
+    struct_type = generator.create_struct_type(elements_arr, 128, is_distinct=True)
+
+    global_var = generator.create_global_var_debug_info(
+        map_name, struct_type, is_local=False
+    )
+    map_global.set_metadata("dbg", global_var)
+    return global_var
 
 
 @MapProcessorRegistry.register("RingBuf")
 def process_ringbuf_map(map_name, rval, module):
     """Process a BPF_RINGBUF map declaration"""
     logger.info(f"Processing Ringbuf: {map_name}")
-    map_params = _parse_map_params(rval, expected_args=["max_entries"])
-    map_params["type"] = BPFMapType.RINGBUF
+    map_params = {"type": BPFMapType.RINGBUF}
+
+    # Parse max_entries if present
+    if len(rval.args) >= 1 and isinstance(rval.args[0], ast.Constant):
+        const_val = rval.args[0].value
+        if isinstance(const_val, int):
+            map_params["max_entries"] = const_val
+
+    for keyword in rval.keywords:
+        if keyword.arg == "max_entries" and isinstance(keyword.value, ast.Constant):
+            const_val = keyword.value.value
+            if isinstance(const_val, int):
+                map_params["max_entries"] = const_val
 
     logger.info(f"Ringbuf map parameters: {map_params}")
 
@@ -90,8 +232,27 @@ def process_ringbuf_map(map_name, rval, module):
 def process_hash_map(map_name, rval, module):
     """Process a BPF_HASH map declaration"""
     logger.info(f"Processing HashMap: {map_name}")
-    map_params = _parse_map_params(rval, expected_args=["key", "value", "max_entries"])
-    map_params["type"] = BPFMapType.HASH
+    map_params = {"type": BPFMapType.HASH}
+
+    # Assuming order: key_type, value_type, max_entries
+    if len(rval.args) >= 1 and isinstance(rval.args[0], ast.Name):
+        map_params["key"] = rval.args[0].id
+    if len(rval.args) >= 2 and isinstance(rval.args[1], ast.Name):
+        map_params["value"] = rval.args[1].id
+    if len(rval.args) >= 3 and isinstance(rval.args[2], ast.Constant):
+        const_val = rval.args[2].value
+        if isinstance(const_val, (int, str)):  # safe check
+            map_params["max_entries"] = const_val
+
+    for keyword in rval.keywords:
+        if keyword.arg == "key" and isinstance(keyword.value, ast.Name):
+            map_params["key"] = keyword.value.id
+        elif keyword.arg == "value" and isinstance(keyword.value, ast.Name):
+            map_params["value"] = keyword.value.id
+        elif keyword.arg == "max_entries" and isinstance(keyword.value, ast.Constant):
+            const_val = keyword.value.value
+            if isinstance(const_val, (int, str)):
+                map_params["max_entries"] = const_val
 
     logger.info(f"Map parameters: {map_params}")
     map_global = create_bpf_map(module, map_name, map_params)
@@ -104,8 +265,18 @@ def process_hash_map(map_name, rval, module):
 def process_perf_event_map(map_name, rval, module):
     """Process a BPF_PERF_EVENT_ARRAY map declaration"""
     logger.info(f"Processing PerfEventArray: {map_name}")
-    map_params = _parse_map_params(rval, expected_args=["key_size", "value_size"])
-    map_params["type"] = BPFMapType.PERF_EVENT_ARRAY
+    map_params = {"type": BPFMapType.PERF_EVENT_ARRAY}
+
+    if len(rval.args) >= 1 and isinstance(rval.args[0], ast.Name):
+        map_params["key_size"] = rval.args[0].id
+    if len(rval.args) >= 2 and isinstance(rval.args[1], ast.Name):
+        map_params["value_size"] = rval.args[1].id
+
+    for keyword in rval.keywords:
+        if keyword.arg == "key_size" and isinstance(keyword.value, ast.Name):
+            map_params["key_size"] = keyword.value.id
+        elif keyword.arg == "value_size" and isinstance(keyword.value, ast.Name):
+            map_params["value_size"] = keyword.value.id
 
     logger.info(f"Map parameters: {map_params}")
     map_global = create_bpf_map(module, map_name, map_params)

pythonbpf/maps/maps_utils.py

@@ -1,3 +1,5 @@
+"""Registry for BPF map processor functions."""
+
 from collections.abc import Callable
 from typing import Any
 
@@ -12,6 +14,7 @@ class MapProcessorRegistry:
         """Decorator to register a processor function for a map type"""
 
         def decorator(func):
+            """Decorator that registers the processor function."""
             cls._processors[map_type_name] = func
             return func
 

pythonbpf/structs/__init__.py

@@ -1,3 +1,5 @@
+"""Struct processing for BPF programs."""
+
 from .structs_pass import structs_proc
 
 __all__ = ["structs_proc"]

pythonbpf/structs/struct_type.py

@@ -1,19 +1,72 @@
+"""
+Struct type wrapper for BPF structs.
+
+This module provides a wrapper class for LLVM IR struct types with
+helper methods for field access and manipulation.
+"""
+
 from llvmlite import ir
 
 
 class StructType:
+    """
+    Wrapper class for LLVM IR struct types with field access helpers.
+
+    Attributes:
+        ir_type: The LLVM IR struct type
+        fields: Dictionary mapping field names to their types
+        size: Total size of the struct in bytes
+    """
+
     def __init__(self, ir_type, fields, size):
+        """
+        Initialize a StructType.
+
+        Args:
+            ir_type: The LLVM IR struct type
+            fields: Dictionary mapping field names to their types
+            size: Total size of the struct in bytes
+        """
         self.ir_type = ir_type
         self.fields = fields
         self.size = size
 
     def field_idx(self, field_name):
+        """
+        Get the index of a field in the struct.
+
+        Args:
+            field_name: The name of the field
+
+        Returns:
+            The zero-based index of the field
+        """
         return list(self.fields.keys()).index(field_name)
 
     def field_type(self, field_name):
+        """
+        Get the LLVM IR type of a field.
+
+        Args:
+            field_name: The name of the field
+
+        Returns:
+            The LLVM IR type of the field
+        """
         return self.fields[field_name]
 
     def gep(self, builder, ptr, field_name):
+        """
+        Generate a GEP (GetElementPtr) instruction to access a struct field.
+
+        Args:
+            builder: LLVM IR builder
+            ptr: Pointer to the struct
+            field_name: Name of the field to access
+
+        Returns:
+            A pointer to the field
+        """
         idx = self.field_idx(field_name)
         return builder.gep(
             ptr,
@@ -22,6 +75,18 @@ class StructType:
         )
 
     def field_size(self, field_name):
+        """
+        Calculate the size of a field in bytes.
+
+        Args:
+            field_name: The name of the field
+
+        Returns:
+            The size of the field in bytes
+
+        Raises:
+            TypeError: If the field type is not supported
+        """
         fld = self.fields[field_name]
         if isinstance(fld, ir.ArrayType):
             return fld.count * (fld.element.width // 8)

pythonbpf/structs/structs_pass.py

@@ -1,3 +1,10 @@
+"""
+BPF struct processing and LLVM IR type generation.
+
+This module handles the processing of Python classes decorated with @struct,
+converting them to LLVM IR struct types for use in BPF programs.
+"""
+
 import ast
 import logging
 from llvmlite import ir
@@ -26,6 +33,15 @@ def structs_proc(tree, module, chunks):
 
 
 def is_bpf_struct(cls_node):
+    """
+    Check if a class node is decorated with @struct.
+
+    Args:
+        cls_node: The AST class node to check
+
+    Returns:
+        True if the class is decorated with @struct, False otherwise
+    """
     return any(
         isinstance(decorator, ast.Name) and decorator.id == "struct"
         for decorator in cls_node.decorator_list
@@ -33,7 +49,16 @@ def is_bpf_struct(cls_node):
 
 
 def process_bpf_struct(cls_node, module):
-    """Process a single BPF struct definition"""
+    """
+    Process a single BPF struct definition and create its LLVM IR representation.
+
+    Args:
+        cls_node: The AST class node representing the struct
+        module: The LLVM IR module (not used in current implementation)
+
+    Returns:
+        A StructType object containing the struct's type information
+    """
 
     fields = parse_struct_fields(cls_node)
     field_types = list(fields.values())
@@ -44,7 +69,18 @@ def process_bpf_struct(cls_node, module):
 
 
 def parse_struct_fields(cls_node):
-    """Parse fields of a struct class node"""
+    """
+    Parse fields of a struct class node.
+
+    Args:
+        cls_node: The AST class node representing the struct
+
+    Returns:
+        A dictionary mapping field names to their LLVM IR types
+
+    Raises:
+        TypeError: If a field has an unsupported type annotation
+    """
     fields = {}
 
     for item in cls_node.body:
@@ -57,7 +93,18 @@ def parse_struct_fields(cls_node):
 
 
 def get_type_from_ann(annotation):
-    """Convert an AST annotation node to an LLVM IR type for struct fields"""
+    """
+    Convert an AST annotation node to an LLVM IR type for struct fields.
+
+    Args:
+        annotation: The AST annotation node (e.g., c_int64, str(32))
+
+    Returns:
+        The corresponding LLVM IR type
+
+    Raises:
+        TypeError: If the annotation type is not supported
+    """
     if isinstance(annotation, ast.Call) and isinstance(annotation.func, ast.Name):
         if annotation.func.id == "str":
             # Char array
@@ -72,7 +119,15 @@ def get_type_from_ann(annotation):
 
 
 def calc_struct_size(field_types):
-    """Calculate total size of the struct with alignment and padding"""
+    """
+    Calculate total size of the struct with alignment and padding.
+
+    Args:
+        field_types: List of LLVM IR types for each field
+
+    Returns:
+        The total size of the struct in bytes
+    """
     curr_offset = 0
     for ftype in field_types:
         if isinstance(ftype, ir.IntType):

pythonbpf/type_deducer.py

@@ -1,3 +1,10 @@
+"""
+Type mapping from Python ctypes to LLVM IR types.
+
+This module provides utilities to convert Python ctypes type names
+to their corresponding LLVM IR representations.
+"""
+
 from llvmlite import ir
 
 # TODO: THIS IS NOT SUPPOSED TO MATCH STRINGS :skull:
@@ -19,10 +26,31 @@ mapping = {
 
 
 def ctypes_to_ir(ctype: str):
+    """
+    Convert a ctypes type name to its corresponding LLVM IR type.
+
+    Args:
+        ctype: String name of the ctypes type (e.g., 'c_int64', 'c_void_p')
+
+    Returns:
+        The corresponding LLVM IR type
+
+    Raises:
+        NotImplementedError: If the ctype is not supported
+    """
     if ctype in mapping:
         return mapping[ctype]
     raise NotImplementedError(f"No mapping for {ctype}")
 
 
 def is_ctypes(ctype: str) -> bool:
+    """
+    Check if a given type name is a supported ctypes type.
+
+    Args:
+        ctype: String name of the type to check
+
+    Returns:
+        True if the type is a supported ctypes type, False otherwise
+    """
     return ctype in mapping

pythonbpf/vmlinux_parser/__init__.py

@@ -1,3 +0,0 @@
-from .import_detector import vmlinux_proc
-
-__all__ = ["vmlinux_proc"]

pythonbpf/vmlinux_parser/class_handler.py

@@ -1,205 +0,0 @@
-import logging
-from functools import lru_cache
-import importlib
-from .dependency_handler import DependencyHandler
-from .dependency_node import DependencyNode
-import ctypes
-from typing import Optional, Any, Dict
-
-logger = logging.getLogger(__name__)
-
-
-@lru_cache(maxsize=1)
-def get_module_symbols(module_name: str):
-    imported_module = importlib.import_module(module_name)
-    return [name for name in dir(imported_module)], imported_module
-
-
-def process_vmlinux_class(node, llvm_module, handler: DependencyHandler):
-    symbols_in_module, imported_module = get_module_symbols("vmlinux")
-    if node.name in symbols_in_module:
-        vmlinux_type = getattr(imported_module, node.name)
-        process_vmlinux_post_ast(vmlinux_type, llvm_module, handler)
-    else:
-        raise ImportError(f"{node.name} not in vmlinux")
-
-
-def process_vmlinux_post_ast(
-    elem_type_class, llvm_handler, handler: DependencyHandler, processing_stack=None
-):
-    # Initialize processing stack on first call
-    if processing_stack is None:
-        processing_stack = set()
-    symbols_in_module, imported_module = get_module_symbols("vmlinux")
-
-    current_symbol_name = elem_type_class.__name__
-    logger.info(f"Begin {current_symbol_name} Processing")
-    field_table: Dict[str, list] = {}
-    is_complex_type = False
-    containing_type: Optional[Any] = None
-    ctype_complex_type: Optional[Any] = None
-    type_length: Optional[int] = None
-    module_name = getattr(elem_type_class, "__module__", None)
-
-    # Check if already processed
-    if handler.has_node(current_symbol_name):
-        logger.debug(f"Node {current_symbol_name} already processed and ready")
-        return True
-
-    # XXX:Check it's use. It's probably not being used.
-    if current_symbol_name in processing_stack:
-        logger.debug(
-            f"Dependency already in processing stack for {current_symbol_name}, skipping"
-        )
-        return True
-
-    processing_stack.add(current_symbol_name)
-
-    if module_name == "vmlinux":
-        if hasattr(elem_type_class, "_type_"):
-            pass
-        else:
-            new_dep_node = DependencyNode(name=current_symbol_name)
-
-            # elem_type_class is the actual vmlinux struct/class
-            new_dep_node.set_ctype_struct(elem_type_class)
-
-            handler.add_node(new_dep_node)
-            class_obj = getattr(imported_module, current_symbol_name)
-            # Inspect the class fields
-            if hasattr(class_obj, "_fields_"):
-                for field_elem in class_obj._fields_:
-                    field_name: str = ""
-                    field_type: Optional[Any] = None
-                    bitfield_size: Optional[int] = None
-                    if len(field_elem) == 2:
-                        field_name, field_type = field_elem
-                    elif len(field_elem) == 3:
-                        field_name, field_type, bitfield_size = field_elem
-                    field_table[field_name] = [field_type, bitfield_size]
-            elif hasattr(class_obj, "__annotations__"):
-                for field_elem in class_obj.__annotations__.items():
-                    if len(field_elem) == 2:
-                        field_name, field_type = field_elem
-                        bitfield_size = None
-                    elif len(field_elem) == 3:
-                        field_name, field_type, bitfield_size = field_elem
-                    else:
-                        raise ValueError(
-                            "Number of fields in items() of class object unexpected"
-                        )
-                    field_table[field_name] = [field_type, bitfield_size]
-            else:
-                raise TypeError("Could not get required class and definition")
-
-            logger.debug(f"Extracted fields for {current_symbol_name}: {field_table}")
-            for elem in field_table.items():
-                elem_name, elem_temp_list = elem
-                [elem_type, elem_bitfield_size] = elem_temp_list
-                local_module_name = getattr(elem_type, "__module__", None)
-                new_dep_node.add_field(elem_name, elem_type, ready=False)
-                if local_module_name == ctypes.__name__:
-                    new_dep_node.set_field_bitfield_size(elem_name, elem_bitfield_size)
-                    new_dep_node.set_field_ready(elem_name, is_ready=True)
-                    logger.debug(
-                        f"Field {elem_name} is direct ctypes type: {elem_type}"
-                    )
-                elif local_module_name == "vmlinux":
-                    new_dep_node.set_field_bitfield_size(elem_name, elem_bitfield_size)
-                    logger.debug(
-                        f"Processing vmlinux field: {elem_name}, type: {elem_type}"
-                    )
-                    if hasattr(elem_type, "_type_"):
-                        is_complex_type = True
-                        containing_type = elem_type._type_
-                        if hasattr(elem_type, "_length_") and is_complex_type:
-                            type_length = elem_type._length_
-
-                        if containing_type.__module__ == "vmlinux":
-                            new_dep_node.add_dependent(
-                                elem_type._type_.__name__
-                                if hasattr(elem_type._type_, "__name__")
-                                else str(elem_type._type_)
-                            )
-                        elif containing_type.__module__ == ctypes.__name__:
-                            if isinstance(elem_type, type):
-                                if issubclass(elem_type, ctypes.Array):
-                                    ctype_complex_type = ctypes.Array
-                                elif issubclass(elem_type, ctypes._Pointer):
-                                    ctype_complex_type = ctypes._Pointer
-                            else:
-                                raise TypeError("Unsupported ctypes subclass")
-                        else:
-                            raise ImportError(
-                                f"Unsupported module of {containing_type}"
-                            )
-                        logger.debug(
-                            f"{containing_type} containing type of parent {elem_name} with {elem_type} and ctype {ctype_complex_type} and length {type_length}"
-                        )
-                        new_dep_node.set_field_containing_type(
-                            elem_name, containing_type
-                        )
-                        new_dep_node.set_field_type_size(elem_name, type_length)
-                        new_dep_node.set_field_ctype_complex_type(
-                            elem_name, ctype_complex_type
-                        )
-                        new_dep_node.set_field_type(elem_name, elem_type)
-                        if containing_type.__module__ == "vmlinux":
-                            containing_type_name = (
-                                containing_type.__name__
-                                if hasattr(containing_type, "__name__")
-                                else str(containing_type)
-                            )
-
-                            # Check for self-reference or already processed
-                            if containing_type_name == current_symbol_name:
-                                # Self-referential pointer
-                                logger.debug(
-                                    f"Self-referential pointer in {current_symbol_name}.{elem_name}"
-                                )
-                                new_dep_node.set_field_ready(elem_name, True)
-                            elif handler.has_node(containing_type_name):
-                                # Already processed
-                                logger.debug(
-                                    f"Reusing already processed {containing_type_name}"
-                                )
-                                new_dep_node.set_field_ready(elem_name, True)
-                            else:
-                                # Process recursively - THIS WAS MISSING
-                                new_dep_node.add_dependent(containing_type_name)
-                                process_vmlinux_post_ast(
-                                    containing_type,
-                                    llvm_handler,
-                                    handler,
-                                    processing_stack,
-                                )
-                                new_dep_node.set_field_ready(elem_name, True)
-                        elif containing_type.__module__ == ctypes.__name__:
-                            logger.debug(f"Processing ctype internal{containing_type}")
-                            new_dep_node.set_field_ready(elem_name, True)
-                        else:
-                            raise TypeError(
-                                "Module not supported in recursive resolution"
-                            )
-                    else:
-                        new_dep_node.add_dependent(
-                            elem_type.__name__
-                            if hasattr(elem_type, "__name__")
-                            else str(elem_type)
-                        )
-                        process_vmlinux_post_ast(
-                            elem_type, llvm_handler, handler, processing_stack
-                        )
-                        new_dep_node.set_field_ready(elem_name, True)
-                else:
-                    raise ValueError(
-                        f"{elem_name} with type {elem_type} from module {module_name} not supported in recursive resolver"
-                    )
-
-    else:
-        raise ImportError("UNSUPPORTED Module")
-
-    logging.info(
-        f"{current_symbol_name} processed and handler readiness {handler.is_ready}"
-    )
-    return True

pythonbpf/vmlinux_parser/dependency_handler.py

@@ -1,173 +0,0 @@
-from typing import Optional, Dict, List, Iterator
-from .dependency_node import DependencyNode
-
-
-class DependencyHandler:
-    """
-    Manages a collection of DependencyNode objects with no duplicates.
-
-    Ensures that no two nodes with the same name can be added and provides
-    methods to check readiness and retrieve specific nodes.
-
-    Example usage:
-        # Create a handler
-        handler = DependencyHandler()
-
-        # Create some dependency nodes
-        node1 = DependencyNode(name="node1")
-        node1.add_field("field1", str)
-        node1.set_field_value("field1", "value1")
-
-        node2 = DependencyNode(name="node2")
-        node2.add_field("field1", int)
-
-        # Add nodes to the handler
-        handler.add_node(node1)
-        handler.add_node(node2)
-
-        # Check if a specific node exists
-        print(handler.has_node("node1"))  # True
-
-        # Get a reference to a node and modify it
-        node = handler.get_node("node2")
-        node.set_field_value("field1", 42)
-
-        # Check if all nodes are ready
-        print(handler.is_ready)  # False (node2 is ready, but node1 isn't)
-    """
-
-    def __init__(self):
-        # Using a dictionary with node names as keys ensures name uniqueness
-        # and provides efficient lookups
-        self._nodes: Dict[str, DependencyNode] = {}
-
-    def add_node(self, node: DependencyNode) -> bool:
-        """
-        Add a dependency node to the handler.
-
-        Args:
-            node: The DependencyNode to add
-
-        Returns:
-            bool: True if the node was added, False if a node with the same name already exists
-
-        Raises:
-            TypeError: If the provided object is not a DependencyNode
-        """
-        if not isinstance(node, DependencyNode):
-            raise TypeError(f"Expected DependencyNode, got {type(node).__name__}")
-
-        # Check if a node with this name already exists
-        if node.name in self._nodes:
-            return False
-
-        self._nodes[node.name] = node
-        return True
-
-    @property
-    def is_ready(self) -> bool:
-        """
-        Check if all nodes are ready.
-
-        Returns:
-            bool: True if all nodes are ready (or if there are no nodes), False otherwise
-        """
-        if not self._nodes:
-            return True
-
-        return all(node.is_ready for node in self._nodes.values())
-
-    def has_node(self, name: str) -> bool:
-        """
-        Check if a node with the given name exists.
-
-        Args:
-            name: The name to check
-
-        Returns:
-            bool: True if a node with the given name exists, False otherwise
-        """
-        return name in self._nodes
-
-    def get_node(self, name: str) -> Optional[DependencyNode]:
-        """
-        Get a node by name for manipulation.
-
-        Args:
-            name: The name of the node to retrieve
-
-        Returns:
-            Optional[DependencyNode]: The node with the given name, or None if not found
-        """
-        return self._nodes.get(name)
-
-    def remove_node(self, node_or_name) -> bool:
-        """
-        Remove a node by name or reference.
-
-        Args:
-            node_or_name: The node to remove or its name
-
-        Returns:
-            bool: True if the node was removed, False if not found
-        """
-        if isinstance(node_or_name, DependencyNode):
-            name = node_or_name.name
-        else:
-            name = node_or_name
-
-        if name in self._nodes:
-            del self._nodes[name]
-            return True
-        return False
-
-    def get_all_nodes(self) -> List[DependencyNode]:
-        """
-        Get all nodes stored in the handler.
-
-        Returns:
-            List[DependencyNode]: List of all nodes
-        """
-        return list(self._nodes.values())
-
-    def __iter__(self) -> Iterator[DependencyNode]:
-        """
-        Iterate over all nodes.
-
-        Returns:
-            Iterator[DependencyNode]: Iterator over all nodes
-        """
-        return iter(self._nodes.values())
-
-    def __len__(self) -> int:
-        """
-        Get the number of nodes in the handler.
-
-        Returns:
-            int: The number of nodes
-        """
-        return len(self._nodes)
-
-    def __getitem__(self, name: str) -> DependencyNode:
-        """
-        Get a node by name using dictionary-style access.
-
-        Args:
-            name: The name of the node to retrieve
-
-        Returns:
-            DependencyNode: The node with the given name
-
-        Raises:
-            KeyError: If no node with the given name exists
-
-        Example:
-            node = handler["some-dep_node_name"]
-        """
-        if name not in self._nodes:
-            raise KeyError(f"No node with name '{name}' found")
-        return self._nodes[name]
-
-    @property
-    def nodes(self):
-        return self._nodes

pythonbpf/vmlinux_parser/dependency_node.py

@@ -1,363 +0,0 @@
-from dataclasses import dataclass, field
-from typing import Dict, Any, Optional
-import ctypes
-
-
-# TODO: FIX THE FUCKING TYPE NAME CONVENTION.
-@dataclass
-class Field:
-    """Represents a field in a dependency node with its type and readiness state."""
-
-    name: str
-    type: type
-    ctype_complex_type: Optional[Any]
-    containing_type: Optional[Any]
-    type_size: Optional[int]
-    bitfield_size: Optional[int]
-    offset: int
-    value: Any = None
-    ready: bool = False
-
-    def set_ready(self, is_ready: bool = True) -> None:
-        """Set the readiness state of this field."""
-        self.ready = is_ready
-
-    def set_value(self, value: Any, mark_ready: bool = False) -> None:
-        """Set the value of this field and optionally mark it as ready."""
-        self.value = value
-        if mark_ready:
-            self.ready = True
-
-    def set_type(self, given_type, mark_ready: bool = False) -> None:
-        """Set value of the type field and mark as ready"""
-        self.type = given_type
-        if mark_ready:
-            self.ready = True
-
-    def set_containing_type(
-        self, containing_type: Optional[Any], mark_ready: bool = False
-    ) -> None:
-        """Set the containing_type of this field and optionally mark it as ready."""
-        self.containing_type = containing_type
-        if mark_ready:
-            self.ready = True
-
-    def set_type_size(self, type_size: Any, mark_ready: bool = False) -> None:
-        """Set the type_size of this field and optionally mark it as ready."""
-        self.type_size = type_size
-        if mark_ready:
-            self.ready = True
-
-    def set_ctype_complex_type(
-        self, ctype_complex_type: Any, mark_ready: bool = False
-    ) -> None:
-        """Set the ctype_complex_type of this field and optionally mark it as ready."""
-        self.ctype_complex_type = ctype_complex_type
-        if mark_ready:
-            self.ready = True
-
-    def set_bitfield_size(self, bitfield_size: Any, mark_ready: bool = False) -> None:
-        """Set the bitfield_size of this field and optionally mark it as ready."""
-        self.bitfield_size = bitfield_size
-        if mark_ready:
-            self.ready = True
-
-    def set_offset(self, offset: int) -> None:
-        """Set the offset of this field"""
-        self.offset = offset
-
-
-@dataclass
-class DependencyNode:
-    """
-    A node with typed fields and readiness tracking.
-
-    Example usage:
-        # Create a dependency node for a Person
-        somestruct = DependencyNode(name="struct_1")
-
-        # Add fields with their types
-        somestruct.add_field("field_1", str)
-        somestruct.add_field("field_2", int)
-        somestruct.add_field("field_3", str)
-
-        # Check if the node is ready (should be False initially)
-        print(f"Is node ready? {somestruct.is_ready}")  # False
-
-        # Set some field values
-        somestruct.set_field_value("field_1", "someproperty")
-        somestruct.set_field_value("field_2", 30)
-
-        # Check if the node is ready (still False because email is not ready)
-        print(f"Is node ready? {somestruct.is_ready}")  # False
-
-        # Set the last field and make the node ready
-        somestruct.set_field_value("field_3", "anotherproperty")
-
-        # Now the node should be ready
-        print(f"Is node ready? {somestruct.is_ready}")  # True
-
-        # You can also mark a field as not ready
-        somestruct.set_field_ready("field_3", False)
-
-        # Now the node is not ready again
-        print(f"Is node ready? {somestruct.is_ready}")  # False
-
-        # Get all field values
-        print(somestruct.get_field_values())  # {'field_1': 'someproperty', 'field_2': 30, 'field_3': 'anotherproperty'}
-
-        # Get only ready fields
-        ready_fields = somestruct.get_ready_fields()
-        print(f"Ready fields: {[field.name for field in ready_fields.values()]}")  # ['field_1', 'field_2']
-    """
-
-    name: str
-    depends_on: Optional[list[str]] = None
-    fields: Dict[str, Field] = field(default_factory=dict)
-    _ready_cache: Optional[bool] = field(default=None, repr=False)
-    current_offset: int = 0
-    ctype_struct: Optional[Any] = field(default=None, repr=False)
-
-    def add_field(
-        self,
-        name: str,
-        field_type: type,
-        initial_value: Any = None,
-        containing_type: Optional[Any] = None,
-        type_size: Optional[int] = None,
-        ctype_complex_type: Optional[int] = None,
-        bitfield_size: Optional[int] = None,
-        ready: bool = False,
-        offset: int = 0,
-    ) -> None:
-        """Add a field to the node with an optional initial value and readiness state."""
-        if self.depends_on is None:
-            self.depends_on = []
-        self.fields[name] = Field(
-            name=name,
-            type=field_type,
-            value=initial_value,
-            ready=ready,
-            containing_type=containing_type,
-            type_size=type_size,
-            ctype_complex_type=ctype_complex_type,
-            bitfield_size=bitfield_size,
-            offset=offset,
-        )
-        # Invalidate readiness cache
-        self._ready_cache = None
-
-    def set_ctype_struct(self, ctype_struct: Any) -> None:
-        """Set the ctypes structure for automatic offset calculation."""
-        self.ctype_struct = ctype_struct
-
-    def __sizeof__(self):
-        # If we have a ctype_struct, use its size
-        if self.ctype_struct is not None:
-            return ctypes.sizeof(self.ctype_struct)
-        return self.current_offset
-
-    def get_field(self, name: str) -> Field:
-        """Get a field by name."""
-        return self.fields[name]
-
-    def set_field_value(self, name: str, value: Any, mark_ready: bool = False) -> None:
-        """Set a field's value and optionally mark it as ready."""
-        if name not in self.fields:
-            raise KeyError(f"Field '{name}' does not exist in node '{self.name}'")
-
-        self.fields[name].set_value(value, mark_ready)
-        # Invalidate readiness cache
-        self._ready_cache = None
-
-    def set_field_type(self, name: str, type: Any, mark_ready: bool = False) -> None:
-        """Set a field's type and optionally mark it as ready."""
-        if name not in self.fields:
-            raise KeyError(f"Field '{name}' does not exist in node '{self.name}'")
-
-        self.fields[name].set_type(type, mark_ready)
-        # Invalidate readiness cache
-        self._ready_cache = None
-
-    def set_field_containing_type(
-        self, name: str, containing_type: Any, mark_ready: bool = False
-    ) -> None:
-        """Set a field's containing_type and optionally mark it as ready."""
-        if name not in self.fields:
-            raise KeyError(f"Field '{name}' does not exist in node '{self.name}'")
-
-        self.fields[name].set_containing_type(containing_type, mark_ready)
-        # Invalidate readiness cache
-        self._ready_cache = None
-
-    def set_field_type_size(
-        self, name: str, type_size: Any, mark_ready: bool = False
-    ) -> None:
-        """Set a field's type_size and optionally mark it as ready."""
-        if name not in self.fields:
-            raise KeyError(f"Field '{name}' does not exist in node '{self.name}'")
-
-        self.fields[name].set_type_size(type_size, mark_ready)
-        # Invalidate readiness cache
-        self._ready_cache = None
-
-    def set_field_ctype_complex_type(
-        self, name: str, ctype_complex_type: Any, mark_ready: bool = False
-    ) -> None:
-        """Set a field's ctype_complex_type and optionally mark it as ready."""
-        if name not in self.fields:
-            raise KeyError(f"Field '{name}' does not exist in node '{self.name}'")
-
-        self.fields[name].set_ctype_complex_type(ctype_complex_type, mark_ready)
-        # Invalidate readiness cache
-        self._ready_cache = None
-
-    def set_field_bitfield_size(
-        self, name: str, bitfield_size: Any, mark_ready: bool = False
-    ) -> None:
-        """Set a field's bitfield_size and optionally mark it as ready."""
-        if name not in self.fields:
-            raise KeyError(f"Field '{name}' does not exist in node '{self.name}'")
-
-        self.fields[name].set_bitfield_size(bitfield_size, mark_ready)
-        # Invalidate readiness cache
-        self._ready_cache = None
-
-    def set_field_ready(
-        self,
-        name: str,
-        is_ready: bool = False,
-        size_of_containing_type: Optional[int] = None,
-    ) -> None:
-        """Mark a field as ready or not ready."""
-        if name not in self.fields:
-            raise KeyError(f"Field '{name}' does not exist in node '{self.name}'")
-
-        self.fields[name].set_ready(is_ready)
-
-        # Use ctypes built-in offset if available
-        if self.ctype_struct is not None:
-            try:
-                self.fields[name].set_offset(getattr(self.ctype_struct, name).offset)
-            except AttributeError:
-                # Fallback to manual calculation if field not found in ctype_struct
-                self.fields[name].set_offset(self.current_offset)
-                self.current_offset += self._calculate_size(
-                    name, size_of_containing_type
-                )
-        else:
-            # Manual offset calculation when no ctype_struct is available
-            self.fields[name].set_offset(self.current_offset)
-            self.current_offset += self._calculate_size(name, size_of_containing_type)
-
-        # Invalidate readiness cache
-        self._ready_cache = None
-
-    def _calculate_size(
-        self, name: str, size_of_containing_type: Optional[int] = None
-    ) -> int:
-        processing_field = self.fields[name]
-        # size_of_field will be in bytes
-        if processing_field.type.__module__ == ctypes.__name__:
-            size_of_field = ctypes.sizeof(processing_field.type)
-            return size_of_field
-        elif processing_field.type.__module__ == "vmlinux":
-            if processing_field.ctype_complex_type is not None:
-                if issubclass(processing_field.ctype_complex_type, ctypes.Array):
-                    if processing_field.containing_type.__module__ == ctypes.__name__:
-                        if (
-                            processing_field.containing_type is not None
-                            and processing_field.type_size is not None
-                        ):
-                            size_of_field = (
-                                ctypes.sizeof(processing_field.containing_type)
-                                * processing_field.type_size
-                            )
-                        else:
-                            raise RuntimeError(
-                                f"{processing_field} has no containing_type or type_size"
-                            )
-                        return size_of_field
-                    elif processing_field.containing_type.__module__ == "vmlinux":
-                        if (
-                            size_of_containing_type is not None
-                            and processing_field.type_size is not None
-                        ):
-                            size_of_field = (
-                                size_of_containing_type * processing_field.type_size
-                            )
-                        else:
-                            raise RuntimeError(
-                                f"{processing_field} has no containing_type or type_size"
-                            )
-                        return size_of_field
-                elif issubclass(processing_field.ctype_complex_type, ctypes._Pointer):
-                    return ctypes.sizeof(ctypes.c_void_p)
-                else:
-                    raise NotImplementedError(
-                        "This subclass of ctype not supported yet"
-                    )
-            elif processing_field.type_size is not None:
-                # Handle vmlinux types with type_size but no ctype_complex_type
-                # This means it's a direct vmlinux struct field (not array/pointer wrapped)
-                # The type_size should already contain the full size of the struct
-                # But if there's a containing_type from vmlinux, we need that size
-                if processing_field.containing_type is not None:
-                    if processing_field.containing_type.__module__ == "vmlinux":
-                        # For vmlinux containing types, we need the pre-calculated size
-                        if size_of_containing_type is not None:
-                            return size_of_containing_type * processing_field.type_size
-                        else:
-                            raise RuntimeError(
-                                f"Field {name}: vmlinux containing_type requires size_of_containing_type"
-                            )
-                    else:
-                        raise ModuleNotFoundError(
-                            f"Containing type module {processing_field.containing_type.__module__} not supported"
-                        )
-                else:
-                    raise RuntimeError("Wrong type found with no containing type")
-            else:
-                # No ctype_complex_type and no type_size, must rely on size_of_containing_type
-                if size_of_containing_type is None:
-                    raise RuntimeError(
-                        f"Size of containing type {size_of_containing_type} is None"
-                    )
-                return size_of_containing_type
-
-        else:
-            raise ModuleNotFoundError("Module is not supported for the operation")
-        raise RuntimeError("control should not reach here")
-
-    @property
-    def is_ready(self) -> bool:
-        """Check if the node is ready (all fields are ready)."""
-        # Use cached value if available
-        if self._ready_cache is not None:
-            return self._ready_cache
-
-        # Calculate readiness only when needed
-        if not self.fields:
-            self._ready_cache = True
-            return True
-
-        self._ready_cache = all(elem.ready for elem in self.fields.values())
-        return self._ready_cache
-
-    def get_field_values(self) -> Dict[str, Any]:
-        """Get a dictionary of field names to their values."""
-        return {name: elem.value for name, elem in self.fields.items()}
-
-    def get_ready_fields(self) -> Dict[str, Field]:
-        """Get all fields that are marked as ready."""
-        return {name: elem for name, elem in self.fields.items() if elem.ready}
-
-    def get_not_ready_fields(self) -> Dict[str, Field]:
-        """Get all fields that are marked as not ready."""
-        return {name: elem for name, elem in self.fields.items() if not elem.ready}
-
-    def add_dependent(self, dep_type):
-        if dep_type in self.depends_on:
-            return
-        else:
-            self.depends_on.append(dep_type)

pythonbpf/vmlinux_parser/import_detector.py

@@ -1,147 +0,0 @@
-import ast
-import logging
-from typing import List, Tuple, Any
-import importlib
-import inspect
-
-from .dependency_handler import DependencyHandler
-from .ir_gen import IRGenerator
-from .class_handler import process_vmlinux_class
-
-logger = logging.getLogger(__name__)
-
-
-def detect_import_statement(tree: ast.AST) -> List[Tuple[str, ast.ImportFrom]]:
-    """
-    Parse AST and detect import statements from vmlinux.
-
-    Returns a list of tuples (module_name, imported_item) for vmlinux imports.
-    Raises SyntaxError for invalid import patterns.
-
-    Args:
-        tree: The AST to parse
-
-    Returns:
-        List of tuples containing (module_name, imported_item) for each vmlinux import
-
-    Raises:
-        SyntaxError: If multiple imports from vmlinux are attempted or import * is used
-    """
-    vmlinux_imports = []
-
-    for node in ast.walk(tree):
-        # Handle "from vmlinux import ..." statements
-        if isinstance(node, ast.ImportFrom):
-            if node.module == "vmlinux":
-                # Check for wildcard import: from vmlinux import *
-                if any(alias.name == "*" for alias in node.names):
-                    raise SyntaxError(
-                        "Wildcard imports from vmlinux are not supported. "
-                        "Please import specific types explicitly."
-                    )
-
-                # Check for multiple imports: from vmlinux import A, B, C
-                if len(node.names) > 1:
-                    imported_names = [alias.name for alias in node.names]
-                    raise SyntaxError(
-                        f"Multiple imports from vmlinux are not supported. "
-                        f"Found: {', '.join(imported_names)}. "
-                        f"Please use separate import statements for each type."
-                    )
-
-                # Check if no specific import is specified (should not happen with valid Python)
-                if len(node.names) == 0:
-                    raise SyntaxError(
-                        "Import from vmlinux must specify at least one type."
-                    )
-
-                # Valid single import
-                for alias in node.names:
-                    import_name = alias.name
-                    # Use alias if provided, otherwise use the original name (commented)
-                    # as_name = alias.asname if alias.asname else alias.name
-                    vmlinux_imports.append(("vmlinux", node))
-                    logger.info(f"Found vmlinux import: {import_name}")
-
-        # Handle "import vmlinux" statements (not typical but should be rejected)
-        elif isinstance(node, ast.Import):
-            for alias in node.names:
-                if alias.name == "vmlinux" or alias.name.startswith("vmlinux."):
-                    raise SyntaxError(
-                        "Direct import of vmlinux module is not supported. "
-                        "Use 'from vmlinux import <type>' instead."
-                    )
-
-    logger.info(f"Total vmlinux imports detected: {len(vmlinux_imports)}")
-    return vmlinux_imports
-
-
-def vmlinux_proc(tree: ast.AST, module):
-    import_statements = detect_import_statement(tree)
-
-    # initialise dependency handler
-    handler = DependencyHandler()
-    # initialise assignment dictionary of name to type
-    assignments: dict[str, tuple[type, Any]] = {}
-
-    if not import_statements:
-        logger.info("No vmlinux imports found")
-        return
-
-    # Import vmlinux module directly
-    try:
-        vmlinux_mod = importlib.import_module("vmlinux")
-    except ImportError:
-        logger.warning("Could not import vmlinux module")
-        return
-
-    source_file = inspect.getsourcefile(vmlinux_mod)
-    if source_file is None:
-        logger.warning("Cannot find source for vmlinux module")
-        return
-
-    with open(source_file, "r") as f:
-        mod_ast = ast.parse(f.read(), filename=source_file)
-
-    for import_mod, import_node in import_statements:
-        for alias in import_node.names:
-            imported_name = alias.name
-            found = False
-            for mod_node in mod_ast.body:
-                if (
-                    isinstance(mod_node, ast.ClassDef)
-                    and mod_node.name == imported_name
-                ):
-                    process_vmlinux_class(mod_node, module, handler)
-                    found = True
-                    break
-                if isinstance(mod_node, ast.Assign):
-                    for target in mod_node.targets:
-                        if isinstance(target, ast.Name) and target.id == imported_name:
-                            process_vmlinux_assign(mod_node, module, assignments)
-                            found = True
-                            break
-                if found:
-                    break
-            if not found:
-                logger.info(
-                    f"{imported_name} not found as ClassDef or Assign in vmlinux"
-                )
-
-    IRGenerator(module, handler)
-    return assignments
-
-
-def process_vmlinux_assign(node, module, assignments: dict[str, tuple[type, Any]]):
-    # Check if this is a simple assignment with a constant value
-    if len(node.targets) == 1 and isinstance(node.targets[0], ast.Name):
-        target_name = node.targets[0].id
-        if isinstance(node.value, ast.Constant):
-            assignments[target_name] = (type(node.value.value), node.value.value)
-            logger.info(
-                f"Added assignment: {target_name} = {node.value.value!r} of type {type(node.value.value)}"
-            )
-        else:
-            raise ValueError(f"Unsupported assignment type for {target_name}")
-    else:
-        raise ValueError("Not a simple assignment")

pythonbpf/vmlinux_parser/ir_gen/__init__.py

@@ -1,3 +0,0 @@
-from .ir_generation import IRGenerator
-
-__all__ = ["IRGenerator"]

pythonbpf/vmlinux_parser/ir_gen/debug_info_gen.py

@@ -1,15 +0,0 @@
-from pythonbpf.debuginfo import DebugInfoGenerator
-
-
-def debug_info_generation(struct, llvm_module):
-    generator = DebugInfoGenerator(llvm_module)
-    # this is sample debug info generation
-    # i64type = generator.get_uint64_type()
-
-    struct_type = generator.create_struct_type([], 64 * 4, is_distinct=True)
-
-    global_var = generator.create_global_var_debug_info(
-        struct.name, struct_type, is_local=False
-    )
-
-    return global_var

pythonbpf/vmlinux_parser/ir_gen/ir_generation.py

@@ -1,161 +0,0 @@
-import ctypes
-import logging
-from ..dependency_handler import DependencyHandler
-from .debug_info_gen import debug_info_generation
-from ..dependency_node import DependencyNode
-import llvmlite.ir as ir
-
-logger = logging.getLogger(__name__)
-
-
-class IRGenerator:
-    # get the assignments dict and add this stuff to it.
-    def __init__(self, llvm_module, handler: DependencyHandler, assignment=None):
-        self.llvm_module = llvm_module
-        self.handler: DependencyHandler = handler
-        self.generated: list[str] = []
-        if not handler.is_ready:
-            raise ImportError(
-                "Semantic analysis of vmlinux imports failed. Cannot generate IR"
-            )
-        for struct in handler:
-            self.struct_processor(struct)
-
-    def struct_processor(self, struct, processing_stack=None):
-        # Initialize processing stack on first call
-        if processing_stack is None:
-            processing_stack = set()
-
-        # If already generated, skip
-        if struct.name in self.generated:
-            return
-
-        # Detect circular dependency
-        if struct.name in processing_stack:
-            logger.info(
-                f"Circular dependency detected for {struct.name}, skipping recursive processing"
-            )
-            # For circular dependencies, we can either:
-            # 1. Use forward declarations (opaque pointers)
-            # 2. Mark as incomplete and process later
-            # 3. Generate a placeholder type
-            # Here we'll just skip and let it be processed in its own call
-            return
-
-        logger.info(f"IR generating for {struct.name}")
-
-        # Add to processing stack before processing dependencies
-        processing_stack.add(struct.name)
-
-        try:
-            # Process all dependencies first
-            if struct.depends_on is None:
-                pass
-            else:
-                for dependency in struct.depends_on:
-                    if dependency not in self.generated:
-                        # Check if dependency exists in handler
-                        if dependency in self.handler.nodes:
-                            dep_node_from_dependency = self.handler[dependency]
-                            # Pass the processing_stack down to track circular refs
-                            self.struct_processor(
-                                dep_node_from_dependency, processing_stack
-                            )
-                        else:
-                            raise RuntimeError(
-                                f"Warning: Dependency {dependency} not found in handler"
-                            )
-
-            # Actual processor logic here after dependencies are resolved
-            self.gen_ir(struct)
-            self.generated.append(struct.name)
-
-        finally:
-            # Remove from processing stack after we're done
-            processing_stack.discard(struct.name)
-
-    def gen_ir(self, struct):
-        # TODO: we add the btf_ama attribute by monkey patching in the end of compilation, but once llvmlite
-        #  accepts our issue, we will resort to normal accessed attribute based attribute addition
-        # currently we generate all possible field accesses for CO-RE and put into the assignment table
-        debug_info = debug_info_generation(struct, self.llvm_module)
-        field_index = 0
-        for field_name, field in struct.fields.items():
-            # does not take arrays and similar types into consideration yet.
-            if field.ctype_complex_type is not None and issubclass(
-                field.ctype_complex_type, ctypes.Array
-            ):
-                array_size = field.type_size
-                containing_type = field.containing_type
-                if containing_type.__module__ == ctypes.__name__:
-                    containing_type_size = ctypes.sizeof(containing_type)
-                    for i in range(0, array_size):
-                        field_co_re_name = self._struct_name_generator(
-                            struct, field, field_index, True, i, containing_type_size
-                        )
-                        globvar = ir.GlobalVariable(
-                            self.llvm_module, ir.IntType(64), name=field_co_re_name
-                        )
-                        globvar.linkage = "external"
-                        globvar.set_metadata("llvm.preserve.access.index", debug_info)
-                    field_index += 1
-            elif field.type_size is not None:
-                array_size = field.type_size
-                containing_type = field.containing_type
-                if containing_type.__module__ == "vmlinux":
-                    containing_type_size = self.handler[
-                        containing_type.__name__
-                    ].current_offset
-                    for i in range(0, array_size):
-                        field_co_re_name = self._struct_name_generator(
-                            struct, field, field_index, True, i, containing_type_size
-                        )
-                        globvar = ir.GlobalVariable(
-                            self.llvm_module, ir.IntType(64), name=field_co_re_name
-                        )
-                        globvar.linkage = "external"
-                        globvar.set_metadata("llvm.preserve.access.index", debug_info)
-                    field_index += 1
-            else:
-                field_co_re_name = self._struct_name_generator(
-                    struct, field, field_index
-                )
-                field_index += 1
-                globvar = ir.GlobalVariable(
-                    self.llvm_module, ir.IntType(64), name=field_co_re_name
-                )
-                globvar.linkage = "external"
-                globvar.set_metadata("llvm.preserve.access.index", debug_info)
-
-    def _struct_name_generator(
-        self,
-        struct: DependencyNode,
-        field,
-        field_index: int,
-        is_indexed: bool = False,
-        index: int = 0,
-        containing_type_size: int = 0,
-    ) -> str:
-        if is_indexed:
-            name = (
-                "llvm."
-                + struct.name.removeprefix("struct_")
-                + f":0:{field.offset + index * containing_type_size}"
-                + "$"
-                + f"0:{field_index}:{index}"
-            )
-            return name
-        elif struct.name.startswith("struct_"):
-            name = (
-                "llvm."
-                + struct.name.removeprefix("struct_")
-                + f":0:{field.offset}"
-                + "$"
-                + f"0:{field_index}"
-            )
-            return name
-        else:
-            print(self.handler[struct.name])
-            raise TypeError(
-                "Name generation cannot occur due to type name not starting with struct"
-            )

tests/c-form/ex2.bpf.c

@@ -1,10 +1,11 @@
-#include "vmlinux.h"
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
-#include <bpf/bpf_endian.h>
+#define u64 unsigned long long
+#define u32 unsigned int
 
 SEC("xdp")
 int hello(struct xdp_md *ctx) {
-    bpf_printk("Hello, World! %ud \n", ctx->data);
+    bpf_printk("Hello, World!\n");
     return XDP_PASS;
 }
 

tests/c-form/ex7.bpf.c

@@ -1,9 +1,23 @@
 // SPDX-License-Identifier: GPL-2.0
 
-#include "vmlinux.h"
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 
+struct trace_entry {
+  short unsigned int type;
+  unsigned char flags;
+  unsigned char preempt_count;
+  int pid;
+};
+
+struct trace_event_raw_sys_enter {
+  struct trace_entry ent;
+  long int id;
+  long unsigned int args[6];
+  char __data[0];
+};
+
 struct event {
   __u32 pid;
   __u32 uid;

tests/failing_tests/assign/retype.py

@@ -1,40 +0,0 @@
-from pythonbpf import bpf, map, section, bpfglobal, compile
-from ctypes import c_void_p, c_int64, c_uint64
-from pythonbpf.maps import HashMap
-
-
-# NOTE: This example tries to reinterpret the variable `x` to a different type.
-# We do not allow this for now, as stack allocations are typed and have to be
-# done in the first basic block. Allowing re-interpretation would require
-# re-allocation of stack space (possibly in a new basic block), which is not
-# supported in eBPF yet.
-# We can allow bitcasts in cases where the width of the types is the same in
-# the future. But for now, we do not allow any re-interpretation of variables.
-
-
-@bpf
-@map
-def last() -> HashMap:
-    return HashMap(key=c_uint64, value=c_uint64, max_entries=3)
-
-
-@bpf
-@section("tracepoint/syscalls/sys_enter_execve")
-def hello_world(ctx: c_void_p) -> c_int64:
-    last.update(0, 1)
-    x = last.lookup(0)
-    x = 20
-    if x == 2:
-        print("Hello, World!")
-    else:
-        print("Goodbye, World!")
-    return
-
-
-@bpf
-@bpfglobal
-def LICENSE() -> str:
-    return "GPL"
-
-
-compile()

tests/failing_tests/globals.py

@@ -3,19 +3,16 @@ import logging
 from pythonbpf import compile, bpf, section, bpfglobal, compile_to_ir
 from ctypes import c_void_p, c_int64, c_int32
 
-
 @bpf
 @bpfglobal
 def somevalue() -> c_int32:
     return c_int32(42)
 
-
 @bpf
 @bpfglobal
 def somevalue2() -> c_int64:
     return c_int64(69)
 
-
 @bpf
 @bpfglobal
 def somevalue1() -> c_int32:
@@ -24,14 +21,12 @@ def somevalue1() -> c_int32:
 
 # --- Passing examples ---
 
-
 # Simple constant return
 @bpf
 @bpfglobal
 def g1() -> c_int64:
     return c_int64(42)
 
-
 # Constructor with one constant argument
 @bpf
 @bpfglobal
@@ -67,17 +62,15 @@ def g2() -> c_int64:
 # def g6() -> c_int64:
 #     return c_int64(CONST)
 
-
 # Constructor with multiple args
-# TODO: this is not working. should it work ?
+#TODO: this is not working. should it work ?
 @bpf
 @bpfglobal
 def g7() -> c_int64:
     return c_int64(1)
 
-
 # Dataclass call
-# TODO: fails with dataclass
+#TODO: fails with dataclass
 # @dataclass
 # class Point:
 #     x: c_int64
@@ -98,7 +91,6 @@ def sometag(ctx: c_void_p) -> c_int64:
     print(f"{somevalue}")
     return c_int64(1)
 
-
 @bpf
 @bpfglobal
 def LICENSE() -> str:

tests/failing_tests/named_arg.py

@@ -11,7 +11,6 @@ from ctypes import c_void_p, c_int64
 # We cannot allocate space for the intermediate type now.
 # We probably need to track the ref/deref chain for each variable.
 
-
 @bpf
 @map
 def count() -> HashMap:

tests/failing_tests/undeclared_values.py

@@ -3,7 +3,6 @@ import logging
 from pythonbpf import compile, bpf, section, bpfglobal, compile_to_ir
 from ctypes import c_void_p, c_int64
 
-
 # This should not pass as somevalue is not declared at all.
 @bpf
 @section("tracepoint/syscalls/sys_enter_execve")
@@ -12,7 +11,6 @@ def sometag(ctx: c_void_p) -> c_int64:
     print(f"{somevalue}")  # noqa: F821
     return c_int64(1)
 
-
 @bpf
 @bpfglobal
 def LICENSE() -> str:

tests/failing_tests/xdp_pass.py

@@ -1,54 +0,0 @@
-from pythonbpf import bpf, map, section, bpfglobal, compile_to_ir
-from pythonbpf.maps import HashMap
-from pythonbpf.helper import XDP_PASS
-from vmlinux import TASK_COMM_LEN  # noqa: F401
-
-from vmlinux import struct_qspinlock  # noqa: F401
-
-# from vmlinux import struct_trace_event_raw_sys_enter  # noqa: F401
-# from vmlinux import struct_posix_cputimers  # noqa: F401
-from vmlinux import struct_xdp_md
-
-# from vmlinux import struct_trace_event_raw_sys_enter  # noqa: F401
-# from vmlinux import struct_ring_buffer_per_cpu  # noqa: F401
-# from vmlinux import struct_request  # noqa: F401
-from ctypes import c_int64
-
-# Instructions to how to run this program
-# 1. Install PythonBPF: pip install pythonbpf
-# 2. Run the program: python examples/xdp_pass.py
-# 3. Run the program with sudo: sudo tools/check.sh run examples/xdp_pass.o
-# 4. Attach object file to any network device with something like ./check.sh xdp examples/xdp_pass.o tailscale0
-# 5. send traffic through the device and observe effects
-
-
-@bpf
-@map
-def count() -> HashMap:
-    return HashMap(key=c_int64, value=c_int64, max_entries=1)
-
-
-@bpf
-@section("xdp")
-def hello_world(ctx: struct_xdp_md) -> c_int64:
-    key = 0
-    one = 1
-    prev = count().lookup(key)
-    if prev:
-        prevval = prev + 1
-        print(f"count: {prevval}")
-        count().update(key, prevval)
-        return XDP_PASS
-    else:
-        count().update(key, one)
-
-    return XDP_PASS
-
-
-@bpf
-@bpfglobal
-def LICENSE() -> str:
-    return "GPL"
-
-
-compile_to_ir("xdp_pass.py", "xdp_pass.ll")

tests/passing_tests/assign/comprehensive.py

@@ -1,74 +0,0 @@
-from pythonbpf import bpf, map, section, bpfglobal, compile, struct
-from ctypes import c_void_p, c_int64, c_int32, c_uint64
-from pythonbpf.maps import HashMap
-from pythonbpf.helper import ktime
-
-
-# NOTE: This is a comprehensive test combining struct, helper, and map features
-# Please note that at line 50, though we have used an absurd expression to test
-# the compiler, it is recommended to use named variables to reduce the amount of
-# scratch space that needs to be allocated.
-
-
-@bpf
-@struct
-class data_t:
-    pid: c_uint64
-    ts: c_uint64
-
-
-@bpf
-@map
-def last() -> HashMap:
-    return HashMap(key=c_uint64, value=c_uint64, max_entries=3)
-
-
-@bpf
-@section("tracepoint/syscalls/sys_enter_execve")
-def hello_world(ctx: c_void_p) -> c_int64:
-    dat = data_t()
-    dat.pid = 123
-    dat.pid = dat.pid + 1
-    print(f"pid is {dat.pid}")
-    tu = 9
-    last.update(0, tu)
-    last.update(1, -last.lookup(0))
-    x = last.lookup(0)
-    print(f"Map value at index 0: {x}")
-    x = x + c_int32(1)
-    print(f"x after adding 32-bit 1 is {x}")
-    x = ktime() - 121
-    print(f"ktime - 121 is {x}")
-    x = last.lookup(0)
-    x = x + 1
-    print(f"x is {x}")
-    if x == 10:
-        jat = data_t()
-        jat.ts = 456
-        print(f"Hello, World!, ts is {jat.ts}")
-        a = last.lookup(0)
-        print(f"a is {a}")
-        last.update(9, 9)
-        last.update(
-            0,
-            last.lookup(last.lookup(0))
-            + last.lookup(last.lookup(0))
-            + last.lookup(last.lookup(0)),
-        )
-        z = last.lookup(0)
-        print(f"new map val at index 0 is {z}")
-    else:
-        a = last.lookup(0)
-        print("Goodbye, World!")
-    c = last.lookup(1 - 1)
-    print(f"c is {c}")
-    return
-
-
-@bpf
-@bpfglobal
-def LICENSE() -> str:
-    return "GPL"
-
-
-compile()

tests/passing_tests/assign/cst_var_binop.py

@@ -1,27 +0,0 @@
-from pythonbpf import bpf, section, bpfglobal, compile
-from ctypes import c_void_p, c_int64
-
-
-@bpf
-@section("tracepoint/syscalls/sys_enter_execve")
-def hello_world(ctx: c_void_p) -> c_int64:
-    x = 1
-    print(f"Initial x: {x}")
-    a = 20
-    x = a
-    print(f"Updated x with a: {x}")
-    x = (x + x) * 3
-    if x == 2:
-        print("Hello, World!")
-    else:
-        print(f"Goodbye, World! {x}")
-    return
-
-
-@bpf
-@bpfglobal
-def LICENSE() -> str:
-    return "GPL"
-
-
-compile()

tests/passing_tests/assign/helper.py

@@ -1,34 +0,0 @@
-from pythonbpf import bpf, map, section, bpfglobal, compile
-from ctypes import c_void_p, c_int64, c_uint64
-from pythonbpf.maps import HashMap
-
-# NOTE: An example of i64** assignment with binops on the RHS
-
-
-@bpf
-@map
-def last() -> HashMap:
-    return HashMap(key=c_uint64, value=c_uint64, max_entries=3)
-
-
-@bpf
-@section("tracepoint/syscalls/sys_enter_execve")
-def hello_world(ctx: c_void_p) -> c_int64:
-    last.update(0, 1)
-    x = last.lookup(0)
-    print(f"{x}")
-    x = x + 1
-    if x == 2:
-        print("Hello, World!")
-    else:
-        print("Goodbye, World!")
-    return
-
-
-@bpf
-@bpfglobal
-def LICENSE() -> str:
-    return "GPL"
-
-
-compile()

tests/passing_tests/assign/struct_and_helper_binops.py

@@ -1,40 +0,0 @@
-from pythonbpf import bpf, section, bpfglobal, compile, struct
-from ctypes import c_void_p, c_int64, c_uint64
-from pythonbpf.helper import ktime
-
-
-@bpf
-@struct
-class data_t:
-    pid: c_uint64
-    ts: c_uint64
-
-
-@bpf
-@section("tracepoint/syscalls/sys_enter_execve")
-def hello_world(ctx: c_void_p) -> c_int64:
-    dat = data_t()
-    dat.pid = 123
-    dat.pid = dat.pid + 1
-    print(f"pid is {dat.pid}")
-    x = ktime() - 121
-    print(f"ktime is {x}")
-    x = 1
-    x = x + 1
-    print(f"x is {x}")
-    if x == 2:
-        jat = data_t()
-        jat.ts = 456
-        print(f"Hello, World!, ts is {jat.ts}")
-    else:
-        print("Goodbye, World!")
-    return
-
-
-@bpf
-@bpfglobal
-def LICENSE() -> str:
-    return "GPL"
-
-
-compile()

tests/passing_tests/return/typecast_var.py

@@ -6,8 +6,8 @@ from ctypes import c_void_p, c_int32
 @section("tracepoint/syscalls/sys_enter_execve")
 def hello_world(ctx: c_void_p) -> c_int32:
     print("Hello, World!")
-    a = 1  # int64
-    return c_int32(a)  # typecast to int32
+    a = 1 # int64
+    return c_int32(a) # typecast to int32
 
 
 @bpf

tests/passing_tests/ringbuf.py

@@ -33,3 +33,5 @@ compile_to_ir("ringbuf.py", "ringbuf.ll")
 compile()
 b = BPF()
 b.load_and_attach()
+while True:
+    print("running")

tools/vmlinux-gen.py

@@ -26,13 +26,8 @@ import tempfile
 
 
 class BTFConverter:
-    def __init__(
-        self,
-        btf_source="/sys/kernel/btf/vmlinux",
-        output_file="vmlinux.py",
-        keep_intermediate=False,
-        verbose=False,
-    ):
+    def __init__(self, btf_source="/sys/kernel/btf/vmlinux", output_file="vmlinux.py",
+                 keep_intermediate=False, verbose=False):
         self.btf_source = btf_source
         self.output_file = output_file
         self.keep_intermediate = keep_intermediate
@@ -49,7 +44,11 @@ class BTFConverter:
         self.log(f"{description}...")
         try:
             result = subprocess.run(
-                cmd, shell=True, check=True, capture_output=True, text=True
+                cmd,
+                shell=True,
+                check=True,
+                capture_output=True,
+                text=True
             )
             if self.verbose and result.stdout:
                 print(result.stdout)
@@ -70,55 +69,51 @@ class BTFConverter:
         """Step 1.5: Preprocess enum definitions."""
         self.log("Preprocessing enum definitions...")
 
-        with open(input_file, "r") as f:
+        with open(input_file, 'r') as f:
             original_code = f.read()
 
         # Extract anonymous enums
         enums = re.findall(
-            r"(?<!typedef\s)(enum\s*\{[^}]*\})\s*(\w+)\s*(?::\s*\d+)?\s*;",
-            original_code,
+            r'(?<!typedef\s)(enum\s*\{[^}]*\})\s*(\w+)\s*(?::\s*\d+)?\s*;',
+            original_code
         )
-        enum_defs = [enum_block + ";" for enum_block, _ in enums]
+        enum_defs = [enum_block + ';' for enum_block, _ in enums]
 
         # Replace anonymous enums with int declarations
         processed_code = re.sub(
-            r"(?<!typedef\s)enum\s*\{[^}]*\}\s*(\w+)\s*(?::\s*\d+)?\s*;",
-            r"int \1;",
-            original_code,
+            r'(?<!typedef\s)enum\s*\{[^}]*\}\s*(\w+)\s*(?::\s*\d+)?\s*;',
+            r'int \1;',
+            original_code
         )
 
         # Prepend enum definitions
         if enum_defs:
-            enum_text = "\n".join(enum_defs) + "\n\n"
+            enum_text = '\n'.join(enum_defs) + '\n\n'
             processed_code = enum_text + processed_code
 
         output_file = os.path.join(self.temp_dir, "vmlinux_processed.h")
-        with open(output_file, "w") as f:
+        with open(output_file, 'w') as f:
             f.write(processed_code)
 
         return output_file
 
     def step2_5_process_kioctx(self, input_file):
-        # TODO: this is a very bad bug and design decision. A single struct has an issue mostly.
+        #TODO: this is a very bad bug and design decision. A single struct has an issue mostly.
         """Step 2.5: Process struct kioctx to extract nested anonymous structs."""
         self.log("Processing struct kioctx nested structs...")
 
-        with open(input_file, "r") as f:
+        with open(input_file, 'r') as f:
             content = f.read()
 
         # Pattern to match struct kioctx with its full body (handles multiple nesting levels)
-        kioctx_pattern = (
-            r"struct\s+kioctx\s*\{(?:[^{}]|\{(?:[^{}]|\{[^{}]*\})*\})*\}\s*;"
-        )
+        kioctx_pattern = r'struct\s+kioctx\s*\{(?:[^{}]|\{(?:[^{}]|\{[^{}]*\})*\})*\}\s*;'
 
         def process_kioctx_replacement(match):
             full_struct = match.group(0)
             self.log(f"Found struct kioctx, length: {len(full_struct)} chars")
 
             # Extract the struct body (everything between outermost { and })
-            body_match = re.search(
-                r"struct\s+kioctx\s*\{(.*)\}\s*;", full_struct, re.DOTALL
-            )
+            body_match = re.search(r'struct\s+kioctx\s*\{(.*)\}\s*;', full_struct, re.DOTALL)
             if not body_match:
                 return full_struct
 
@@ -126,7 +121,7 @@ class BTFConverter:
 
             # Find all anonymous structs within the body
             # Pattern: struct { ... } followed by ; (not a member name)
-            # anon_struct_pattern = r"struct\s*\{[^}]*\}"
+            anon_struct_pattern = r'struct\s*\{[^}]*\}'
 
             anon_structs = []
             anon_counter = 4  # Start from 4, counting down to 1
@@ -136,9 +131,7 @@ class BTFConverter:
                 anon_struct_content = m.group(0)
 
                 # Extract the body of the anonymous struct
-                anon_body_match = re.search(
-                    r"struct\s*\{(.*)\}", anon_struct_content, re.DOTALL
-                )
+                anon_body_match = re.search(r'struct\s*\{(.*)\}', anon_struct_content, re.DOTALL)
                 if not anon_body_match:
                     return anon_struct_content
 
@@ -161,7 +154,7 @@ class BTFConverter:
             processed_body = body
 
             # Find all occurrences and process them
-            pattern_with_semicolon = r"struct\s*\{([^}]*)\}\s*;"
+            pattern_with_semicolon = r'struct\s*\{([^}]*)\}\s*;'
             matches = list(re.finditer(pattern_with_semicolon, body, re.DOTALL))
 
             if not matches:
@@ -185,16 +178,14 @@ class BTFConverter:
 
                 # Replace in the body
                 replacement = f"struct {anon_name} {member_name};"
-                processed_body = (
-                    processed_body[:start_pos] + replacement + processed_body[end_pos:]
-                )
+                processed_body = processed_body[:start_pos] + replacement + processed_body[end_pos:]
 
                 anon_counter -= 1
 
             # Rebuild the complete definition
             if anon_structs:
                 # Prepend the anonymous struct definitions
-                anon_definitions = "\n".join(anon_structs) + "\n\n"
+                anon_definitions = '\n'.join(anon_structs) + '\n\n'
                 new_struct = f"struct kioctx {{{processed_body}}};"
                 return anon_definitions + new_struct
             else:
@@ -202,11 +193,14 @@ class BTFConverter:
 
         # Apply the transformation
         processed_content = re.sub(
-            kioctx_pattern, process_kioctx_replacement, content, flags=re.DOTALL
+            kioctx_pattern,
+            process_kioctx_replacement,
+            content,
+            flags=re.DOTALL
         )
 
         output_file = os.path.join(self.temp_dir, "vmlinux_kioctx_processed.h")
-        with open(output_file, "w") as f:
+        with open(output_file, 'w') as f:
             f.write(processed_content)
 
         self.log(f"Saved kioctx-processed output to {output_file}")
@@ -224,7 +218,7 @@ class BTFConverter:
         output_file = os.path.join(self.temp_dir, "vmlinux_raw.py")
         cmd = (
             f"clang2py {input_file} -o {output_file} "
-            f'--clang-args="-fno-ms-extensions -I/usr/include -I/usr/include/linux"'
+            f"--clang-args=\"-fno-ms-extensions -I/usr/include -I/usr/include/linux\""
         )
         self.run_command(cmd, "Converting to Python ctypes")
         return output_file
@@ -240,21 +234,25 @@ class BTFConverter:
         data = re.sub(r"\('_[0-9]+',\s*ctypes\.[a-zA-Z0-9_]+,\s*0\),?\s*\n?", "", data)
 
         # Replace ('_20', ctypes.c_uint64, 64) → ('_20', ctypes.c_uint64)
-        data = re.sub(
-            r"\('(_[0-9]+)',\s*(ctypes\.[a-zA-Z0-9_]+),\s*[0-9]+\)", r"('\1', \2)", data
-        )
+        data = re.sub(r"\('(_[0-9]+)',\s*(ctypes\.[a-zA-Z0-9_]+),\s*[0-9]+\)", r"('\1', \2)", data)
 
         # Replace ('_20', ctypes.c_char, 8) with ('_20', ctypes.c_uint8, 8)
-        data = re.sub(r"(ctypes\.c_char)(\s*,\s*\d+\))", r"ctypes.c_uint8\2", data)
+        data = re.sub(
+            r"(ctypes\.c_char)(\s*,\s*\d+\))",
+            r"ctypes.c_uint8\2",
+            data
+        )
 
         # below to replace those c_bool with bitfield greater than 8
         def repl(m):
             name, bits = m.groups()
-            return (
-                f"('{name}', ctypes.c_uint32, {bits})" if int(bits) > 8 else m.group(0)
-            )
+            return f"('{name}', ctypes.c_uint32, {bits})" if int(bits) > 8 else m.group(0)
 
-        data = re.sub(r"\('([^']+)',\s*ctypes\.c_bool,\s*(\d+)\)", repl, data)
+        data = re.sub(
+            r"\('([^']+)',\s*ctypes\.c_bool,\s*(\d+)\)",
+            repl,
+            data
+        )
 
         # Remove ctypes. prefix from invalid entries
         invalid_ctypes = ["bpf_iter_state", "_cache_type", "fs_context_purpose"]
@@ -271,7 +269,6 @@ class BTFConverter:
         if not self.keep_intermediate and self.temp_dir != ".":
             self.log(f"Cleaning up temporary directory: {self.temp_dir}")
             import shutil
-
             shutil.rmtree(self.temp_dir, ignore_errors=True)
 
     def convert(self):
@@ -295,7 +292,6 @@ class BTFConverter:
         except Exception as e:
             print(f"\n✗ Error during conversion: {e}", file=sys.stderr)
             import traceback
-
             traceback.print_exc()
             sys.exit(1)
         finally:
@@ -308,13 +304,18 @@ class BTFConverter:
         dependencies = {
             "bpftool": "bpftool --version",
             "clang": "clang --version",
-            "clang2py": "clang2py --version",
+            "clang2py": "clang2py --version"
         }
 
         missing = []
         for tool, cmd in dependencies.items():
             try:
-                subprocess.run(cmd, shell=True, check=True, capture_output=True)
+                subprocess.run(
+                    cmd,
+                    shell=True,
+                    check=True,
+                    capture_output=True
+                )
             except subprocess.CalledProcessError:
                 missing.append(tool)
 
@@ -336,31 +337,31 @@ Examples:
   %(prog)s
   %(prog)s -o kernel_types.py
   %(prog)s --btf-source /sys/kernel/btf/custom_module -k -v
-        """,
+        """
     )
 
     parser.add_argument(
         "--btf-source",
         default="/sys/kernel/btf/vmlinux",
-        help="Path to BTF source (default: /sys/kernel/btf/vmlinux)",
+        help="Path to BTF source (default: /sys/kernel/btf/vmlinux)"
     )
 
     parser.add_argument(
-        "-o",
-        "--output",
+        "-o", "--output",
         default="vmlinux.py",
-        help="Output Python file (default: vmlinux.py)",
+        help="Output Python file (default: vmlinux.py)"
     )
 
     parser.add_argument(
-        "-k",
-        "--keep-intermediate",
+        "-k", "--keep-intermediate",
         action="store_true",
-        help="Keep intermediate files (vmlinux.h, vmlinux_processed.h, etc.)",
+        help="Keep intermediate files (vmlinux.h, vmlinux_processed.h, etc.)"
     )
 
     parser.add_argument(
-        "-v", "--verbose", action="store_true", help="Enable verbose output"
+        "-v", "--verbose",
+        action="store_true",
+        help="Enable verbose output"
     )
 
     args = parser.parse_args()
@@ -369,7 +370,7 @@ Examples:
         btf_source=args.btf_source,
         output_file=args.output,
         keep_intermediate=args.keep_intermediate,
-        verbose=args.verbose,
+        verbose=args.verbose
     )
 
     converter.convert()