Make handle_return (crude for now)

Author: r41k0u

pythonbpf/functions/functions_pass.py

@@ -9,6 +9,7 @@
 from pythonbpf.binary_ops import handle_binary_op
 from pythonbpf.expr_pass import eval_expr, handle_expr
 
+
 logger = logging.getLogger(__name__)
 
 
@@ -350,6 +351,65 @@ def handle_if(
     builder.position_at_end(merge_block)
 
 
+def handle_return(
+    func, module, builder, stmt, map_sym_tab, local_sym_tab, struct_sym_tab, ret_type
+):
+    if stmt.value is None:
+        builder.ret(ir.Constant(ir.IntType(64), 0))
+        return True
+    elif (
+        isinstance(stmt.value, ast.Call)
+        and isinstance(stmt.value.func, ast.Name)
+        and len(stmt.value.args) == 1
+    ):
+        if isinstance(stmt.value.args[0], ast.Constant) and isinstance(
+            stmt.value.args[0].value, int
+        ):
+            call_type = stmt.value.func.id
+            if ctypes_to_ir(call_type) != ret_type:
+                raise ValueError(
+                    "Return type mismatch: expected"
+                    f"{ctypes_to_ir(call_type)}, got {call_type}"
+                )
+            else:
+                builder.ret(ir.Constant(ret_type, stmt.value.args[0].value))
+                return True
+        elif isinstance(stmt.value.args[0], ast.BinOp):
+            # TODO: Should be routed through eval_expr
+            val = handle_binary_op(stmt.value.args[0], builder, None, local_sym_tab)
+            if val is None:
+                raise ValueError("Failed to evaluate return expression")
+            if val[1] != ret_type:
+                raise ValueError(
+                    f"Return type mismatch: expected {ret_type}, got {val[1]}"
+                )
+            builder.ret(val[0])
+            return True
+        elif isinstance(stmt.value.args[0], ast.Name):
+            if stmt.value.args[0].id in local_sym_tab:
+                var = local_sym_tab[stmt.value.args[0].id].var
+                val = builder.load(var)
+                if val.type != ret_type:
+                    raise ValueError(
+                        f"Return type mismatch: expected {ret_type}, got {val.type}"
+                    )
+                builder.ret(val)
+                return True
+            else:
+                raise ValueError("Failed to evaluate return expression")
+    elif isinstance(stmt.value, ast.Name):
+        if stmt.value.id == "XDP_PASS":
+            builder.ret(ir.Constant(ret_type, 2))
+            return True
+        elif stmt.value.id == "XDP_DROP":
+            builder.ret(ir.Constant(ret_type, 1))
+            return True
+        else:
+            raise ValueError("Failed to evaluate return expression")
+    else:
+        raise ValueError("Unsupported return value")
+
+
 def process_stmt(
     func,
     module,
@@ -383,60 +443,16 @@ def process_stmt(
             func, module, builder, stmt, map_sym_tab, local_sym_tab, structs_sym_tab
         )
     elif isinstance(stmt, ast.Return):
-        if stmt.value is None:
-            builder.ret(ir.Constant(ir.IntType(64), 0))
-            did_return = True
-        elif (
-            isinstance(stmt.value, ast.Call)
-            and isinstance(stmt.value.func, ast.Name)
-            and len(stmt.value.args) == 1
-        ):
-            if isinstance(stmt.value.args[0], ast.Constant) and isinstance(
-                stmt.value.args[0].value, int
-            ):
-                call_type = stmt.value.func.id
-                if ctypes_to_ir(call_type) != ret_type:
-                    raise ValueError(
-                        "Return type mismatch: expected"
-                        f"{ctypes_to_ir(call_type)}, got {call_type}"
-                    )
-                else:
-                    builder.ret(ir.Constant(ret_type, stmt.value.args[0].value))
-                    did_return = True
-            elif isinstance(stmt.value.args[0], ast.BinOp):
-                # TODO: Should be routed through eval_expr
-                val = handle_binary_op(stmt.value.args[0], builder, None, local_sym_tab)
-                if val is None:
-                    raise ValueError("Failed to evaluate return expression")
-                if val[1] != ret_type:
-                    raise ValueError(
-                        f"Return type mismatch: expected {ret_type}, got {val[1]}"
-                    )
-                builder.ret(val[0])
-                did_return = True
-            elif isinstance(stmt.value.args[0], ast.Name):
-                if stmt.value.args[0].id in local_sym_tab:
-                    var = local_sym_tab[stmt.value.args[0].id].var
-                    val = builder.load(var)
-                    if val.type != ret_type:
-                        raise ValueError(
-                            f"Return type mismatch: expected {ret_type}, got {val.type}"
-                        )
-                    builder.ret(val)
-                    did_return = True
-                else:
-                    raise ValueError("Failed to evaluate return expression")
-        elif isinstance(stmt.value, ast.Name):
-            if stmt.value.id == "XDP_PASS":
-                builder.ret(ir.Constant(ret_type, 2))
-                did_return = True
-            elif stmt.value.id == "XDP_DROP":
-                builder.ret(ir.Constant(ret_type, 1))
-                did_return = True
-            else:
-                raise ValueError("Failed to evaluate return expression")
-        else:
-            raise ValueError("Unsupported return value")
+        did_return = handle_return(
+            func,
+            module,
+            builder,
+            stmt,
+            map_sym_tab,
+            local_sym_tab,
+            structs_sym_tab,
+            ret_type,
+        )
     return did_return