add failing test

.pre-commit-config.yaml

@@ -41,14 +41,14 @@ repos:
     - id: ruff
       args: ["--fix", "--show-fixes"]
     - id: ruff-format
-      exclude: ^(docs)|^(tests)|^(examples)
+      exclude: ^(tests/|examples/|docs/)
 
 # Checking static types
 - repo: https://github.com/pre-commit/mirrors-mypy
   rev: "v1.10.0"
   hooks:
     - id: mypy
-      exclude: ^(tests)|^(examples)
+      exclude: ^(tests/|examples/)
       additional_dependencies: [types-setuptools]
 
 # Changes tabs to spaces

examples/hello_world.py

@@ -22,9 +22,5 @@ def LICENSE() -> str:
 
 b = BPF()
 b.load_and_attach()
-if b.is_loaded() and b.is_attached():
-    print("Successfully loaded and attached")
-else:
-    print("Could not load successfully")
 
 # Now cat /sys/kernel/debug/tracing/trace_pipe to see results of the execve syscall.

pythonbpf/binary_ops.py

@@ -25,7 +25,7 @@ def handle_binary_op(rval, module, builder, var_name, local_sym_tab, map_sym_tab
     # Handle left operand
     if isinstance(left, ast.Name):
         if left.id in local_sym_tab:
-            left = recursive_dereferencer(local_sym_tab[left.id].var, builder)
+            left = recursive_dereferencer(local_sym_tab[left.id][0], builder)
         else:
             raise SyntaxError(f"Undefined variable: {left.id}")
     elif isinstance(left, ast.Constant):
@@ -35,7 +35,7 @@ def handle_binary_op(rval, module, builder, var_name, local_sym_tab, map_sym_tab
 
     if isinstance(right, ast.Name):
         if right.id in local_sym_tab:
-            right = recursive_dereferencer(local_sym_tab[right.id].var, builder)
+            right = recursive_dereferencer(local_sym_tab[right.id][0], builder)
         else:
             raise SyntaxError(f"Undefined variable: {right.id}")
     elif isinstance(right, ast.Constant):
@@ -46,26 +46,26 @@ def handle_binary_op(rval, module, builder, var_name, local_sym_tab, map_sym_tab
     print(f"left is {left}, right is {right}, op is {op}")
 
     if isinstance(op, ast.Add):
-        builder.store(builder.add(left, right), local_sym_tab[var_name].var)
+        builder.store(builder.add(left, right), local_sym_tab[var_name][0])
     elif isinstance(op, ast.Sub):
-        builder.store(builder.sub(left, right), local_sym_tab[var_name].var)
+        builder.store(builder.sub(left, right), local_sym_tab[var_name][0])
     elif isinstance(op, ast.Mult):
-        builder.store(builder.mul(left, right), local_sym_tab[var_name].var)
+        builder.store(builder.mul(left, right), local_sym_tab[var_name][0])
     elif isinstance(op, ast.Div):
-        builder.store(builder.sdiv(left, right), local_sym_tab[var_name].var)
+        builder.store(builder.sdiv(left, right), local_sym_tab[var_name][0])
     elif isinstance(op, ast.Mod):
-        builder.store(builder.srem(left, right), local_sym_tab[var_name].var)
+        builder.store(builder.srem(left, right), local_sym_tab[var_name][0])
     elif isinstance(op, ast.LShift):
-        builder.store(builder.shl(left, right), local_sym_tab[var_name].var)
+        builder.store(builder.shl(left, right), local_sym_tab[var_name][0])
     elif isinstance(op, ast.RShift):
-        builder.store(builder.lshr(left, right), local_sym_tab[var_name].var)
+        builder.store(builder.lshr(left, right), local_sym_tab[var_name][0])
     elif isinstance(op, ast.BitOr):
-        builder.store(builder.or_(left, right), local_sym_tab[var_name].var)
+        builder.store(builder.or_(left, right), local_sym_tab[var_name][0])
     elif isinstance(op, ast.BitXor):
-        builder.store(builder.xor(left, right), local_sym_tab[var_name].var)
+        builder.store(builder.xor(left, right), local_sym_tab[var_name][0])
     elif isinstance(op, ast.BitAnd):
-        builder.store(builder.and_(left, right), local_sym_tab[var_name].var)
+        builder.store(builder.and_(left, right), local_sym_tab[var_name][0])
     elif isinstance(op, ast.FloorDiv):
-        builder.store(builder.udiv(left, right), local_sym_tab[var_name].var)
+        builder.store(builder.udiv(left, right), local_sym_tab[var_name][0])
     else:
         raise SyntaxError("Unsupported binary operation")

pythonbpf/expr_pass.py

@@ -10,13 +10,15 @@ def eval_expr(
     local_sym_tab,
     map_sym_tab,
     structs_sym_tab=None,
+    local_var_metadata=None,
 ):
     print(f"Evaluating expression: {ast.dump(expr)}")
+    print(local_var_metadata)
     if isinstance(expr, ast.Name):
         if expr.id in local_sym_tab:
-            var = local_sym_tab[expr.id].var
+            var = local_sym_tab[expr.id][0]
             val = builder.load(var)
-            return val, local_sym_tab[expr.id].ir_type  # return value and type
+            return val, local_sym_tab[expr.id][1]  # return value and type
         else:
             print(f"Undefined variable {expr.id}")
             return None
@@ -49,7 +51,7 @@ def eval_expr(
                     return None
                 if isinstance(arg, ast.Name):
                     if arg.id in local_sym_tab:
-                        arg = local_sym_tab[arg.id].var
+                        arg = local_sym_tab[arg.id][0]
                     else:
                         print(f"Undefined variable {arg.id}")
                         return None
@@ -58,7 +60,7 @@ def eval_expr(
                     return None
                 # Since we are handling only name case, directly take type from sym tab
                 val = builder.load(arg)
-                return val, local_sym_tab[expr.args[0].id].ir_type
+                return val, local_sym_tab[expr.args[0].id][1]
 
             # check for helpers
             if HelperHandlerRegistry.has_handler(expr.func.id):
@@ -70,6 +72,7 @@ def eval_expr(
                     local_sym_tab,
                     map_sym_tab,
                     structs_sym_tab,
+                    local_var_metadata,
                 )
         elif isinstance(expr.func, ast.Attribute):
             print(f"Handling method call: {ast.dump(expr.func)}")
@@ -86,6 +89,7 @@ def eval_expr(
                         local_sym_tab,
                         map_sym_tab,
                         structs_sym_tab,
+                        local_var_metadata,
                     )
             elif isinstance(expr.func.value, ast.Name):
                 obj_name = expr.func.value.id
@@ -100,16 +104,19 @@ def eval_expr(
                             local_sym_tab,
                             map_sym_tab,
                             structs_sym_tab,
+                            local_var_metadata,
                         )
     elif isinstance(expr, ast.Attribute):
         if isinstance(expr.value, ast.Name):
             var_name = expr.value.id
             attr_name = expr.attr
             if var_name in local_sym_tab:
-                var_ptr, var_type, var_metadata = local_sym_tab[var_name]
+                var_ptr, var_type = local_sym_tab[var_name]
-                print(f"Loading attribute {attr_name} from variable {var_name}")
+                print(f"Loading attribute " f"{attr_name} from variable {var_name}")
                 print(f"Variable type: {var_type}, Variable ptr: {var_ptr}")
-                metadata = structs_sym_tab[var_metadata]
+                print(local_var_metadata)
+                if local_var_metadata and var_name in local_var_metadata:
+                    metadata = structs_sym_tab[local_var_metadata[var_name]]
                     if attr_name in metadata.fields:
                         gep = metadata.gep(builder, var_ptr, attr_name)
                         val = builder.load(gep)
@@ -127,9 +134,11 @@ def handle_expr(
     local_sym_tab,
     map_sym_tab,
     structs_sym_tab,
+    local_var_metadata,
 ):
     """Handle expression statements in the function body."""
     print(f"Handling expression: {ast.dump(expr)}")
+    print(local_var_metadata)
     call = expr.value
     if isinstance(call, ast.Call):
         eval_expr(
@@ -140,6 +149,7 @@ def handle_expr(
             local_sym_tab,
             map_sym_tab,
             structs_sym_tab,
+            local_var_metadata,
         )
     else:
         print("Unsupported expression type")

pythonbpf/functions_pass.py

@@ -1,27 +1,13 @@
 from llvmlite import ir
 import ast
-import logging
 from typing import Any
-from dataclasses import dataclass
 
 from .helper import HelperHandlerRegistry, handle_helper_call
 from .type_deducer import ctypes_to_ir
 from .binary_ops import handle_binary_op
 from .expr_pass import eval_expr, handle_expr
 
-logger = logging.getLogger(__name__)
+local_var_metadata: dict[str | Any, Any] = {}
-
-
-@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 get_probe_string(func_node):
@@ -61,12 +47,13 @@ def handle_assign(
     if isinstance(target, ast.Attribute):
         # struct field assignment
         field_name = target.attr
-        if var_name in local_sym_tab:
+        if var_name in local_sym_tab and var_name in local_var_metadata:
-            struct_type = local_sym_tab[var_name].metadata
+            struct_type = local_var_metadata[var_name]
             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
+                    builder, local_sym_tab[var_name][0], field_name
                 )
                 val = eval_expr(
                     func,
@@ -96,21 +83,18 @@ def handle_assign(
     elif isinstance(rval, ast.Constant):
         if isinstance(rval.value, bool):
             if rval.value:
-                builder.store(
+                builder.store(ir.Constant(ir.IntType(1), 1), local_sym_tab[var_name][0])
-                    ir.Constant(ir.IntType(1), 1), local_sym_tab[var_name].var
-                )
             else:
-                builder.store(
+                builder.store(ir.Constant(ir.IntType(1), 0), local_sym_tab[var_name][0])
-                    ir.Constant(ir.IntType(1), 0), local_sym_tab[var_name].var
-                )
             print(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
+                ir.Constant(ir.IntType(64), rval.value), local_sym_tab[var_name][0]
             )
+            # local_sym_tab[var_name] = var
             print(f"Assigned constant {rval.value} to {var_name}")
         elif isinstance(rval.value, str):
             str_val = rval.value.encode("utf-8") + b"\x00"
@@ -124,7 +108,7 @@ def handle_assign(
             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)
+            builder.store(str_ptr, local_sym_tab[var_name][0])
             print(f"Assigned string constant '{rval.value}' to {var_name}")
         else:
             print("Unsupported constant type")
@@ -142,13 +126,13 @@ def handle_assign(
                 # var = builder.alloca(ir_type, name=var_name)
                 # var.align = ir_type.width // 8
                 builder.store(
-                    ir.Constant(ir_type, rval.args[0].value),
+                    ir.Constant(ir_type, rval.args[0].value), local_sym_tab[var_name][0]
-                    local_sym_tab[var_name].var,
                 )
                 print(
                     f"Assigned {call_type} constant "
                     f"{rval.args[0].value} to {var_name}"
                 )
+                # local_sym_tab[var_name] = var
             elif HelperHandlerRegistry.has_handler(call_type):
                 # var = builder.alloca(ir.IntType(64), name=var_name)
                 # var.align = 8
@@ -160,8 +144,10 @@ def handle_assign(
                     local_sym_tab,
                     map_sym_tab,
                     structs_sym_tab,
+                    local_var_metadata,
                 )
-                builder.store(val[0], local_sym_tab[var_name].var)
+                builder.store(val[0], local_sym_tab[var_name][0])
+                # local_sym_tab[var_name] = var
                 print(f"Assigned constant {rval.func.id} to {var_name}")
             elif call_type == "deref" and len(rval.args) == 1:
                 print(f"Handling deref assignment {ast.dump(rval)}")
@@ -178,15 +164,18 @@ def handle_assign(
                     print("Failed to evaluate deref argument")
                     return
                 print(f"Dereferenced value: {val}, storing in {var_name}")
-                builder.store(val[0], local_sym_tab[var_name].var)
+                builder.store(val[0], local_sym_tab[var_name][0])
+                # local_sym_tab[var_name] = var
                 print(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)
+                builder.store(ir.Constant(ir_type, None), local_sym_tab[var_name][0])
+                local_var_metadata[var_name] = call_type
                 print(f"Assigned struct {call_type} to {var_name}")
+                # local_sym_tab[var_name] = var
             else:
                 print(f"Unsupported assignment call type: {call_type}")
         elif isinstance(rval.func, ast.Attribute):
@@ -209,10 +198,12 @@ def handle_assign(
                             local_sym_tab,
                             map_sym_tab,
                             structs_sym_tab,
+                            local_var_metadata,
                         )
                         # var = builder.alloca(ir.IntType(64), name=var_name)
                         # var.align = 8
-                        builder.store(val[0], local_sym_tab[var_name].var)
+                        builder.store(val[0], local_sym_tab[var_name][0])
+                        # local_sym_tab[var_name] = var
             else:
                 print("Unsupported assignment call structure")
         else:
@@ -236,7 +227,7 @@ def handle_cond(func, module, builder, cond, local_sym_tab, map_sym_tab):
             return None
     elif isinstance(cond, ast.Name):
         if cond.id in local_sym_tab:
-            var = local_sym_tab[cond.id].var
+            var = local_sym_tab[cond.id][0]
             val = builder.load(var)
             if val.type != ir.IntType(1):
                 # Convert nonzero values to true, zero to false
@@ -351,6 +342,7 @@ def process_stmt(
 ):
     print(f"Processing statement: {ast.dump(stmt)}")
     if isinstance(stmt, ast.Expr):
+        print(local_var_metadata)
         handle_expr(
             func,
             module,
@@ -359,6 +351,7 @@ def process_stmt(
             local_sym_tab,
             map_sym_tab,
             structs_sym_tab,
+            local_var_metadata,
         )
     elif isinstance(stmt, ast.Assign):
         handle_assign(
@@ -408,7 +401,6 @@ def allocate_mem(
     module, builder, body, func, ret_type, map_sym_tab, local_sym_tab, structs_sym_tab
 ):
     for stmt in body:
-        has_metadata = False
         if isinstance(stmt, ast.If):
             if stmt.body:
                 local_sym_tab = allocate_mem(
@@ -466,7 +458,7 @@ def allocate_mem(
                         struct_info = structs_sym_tab[call_type]
                         ir_type = struct_info.ir_type
                         var = builder.alloca(ir_type, name=var_name)
-                        has_metadata = True
+                        local_var_metadata[var_name] = call_type
                         print(
                             f"Pre-allocated variable {var_name} "
                             f"for struct {call_type}"
@@ -508,11 +500,7 @@ def allocate_mem(
             else:
                 print("Unsupported assignment value type")
                 continue
-
+            local_sym_tab[var_name] = (var, ir_type)
-            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
 
 
@@ -674,7 +662,7 @@ def infer_return_type(func_node: ast.FunctionDef):
             if found_type is None:
                 found_type = t
             elif found_type != t:
-                raise ValueError(f"Conflicting return types: {found_type} vs {t}")
+                raise ValueError("Conflicting return types:" f"{found_type} vs {t}")
     return found_type or "None"
 
 

pythonbpf/helper/bpf_helper_handler.py

@@ -19,6 +19,8 @@ class BPFHelperID(Enum):
     BPF_PRINTK = 6
     BPF_GET_CURRENT_PID_TGID = 14
     BPF_PERF_EVENT_OUTPUT = 25
+    BPF_RINGBUF_RESERVE = 131
+    BPF_RINGBUF_SUBMIT = 132
 
 
 @HelperHandlerRegistry.register("ktime")
@@ -30,6 +32,7 @@ def bpf_ktime_get_ns_emitter(
     func,
     local_sym_tab=None,
     struct_sym_tab=None,
+    local_var_metadata=None,
 ):
     """
     Emit LLVM IR for bpf_ktime_get_ns helper function call.
@@ -52,6 +55,7 @@ def bpf_map_lookup_elem_emitter(
     func,
     local_sym_tab=None,
     struct_sym_tab=None,
+    local_var_metadata=None,
 ):
     """
     Emit LLVM IR for bpf_map_lookup_elem helper function call.
@@ -87,6 +91,7 @@ def bpf_printk_emitter(
     func,
     local_sym_tab=None,
     struct_sym_tab=None,
+    local_var_metadata=None,
 ):
     """Emit LLVM IR for bpf_printk helper function call."""
     if not hasattr(func, "_fmt_counter"):
@@ -104,6 +109,7 @@ def bpf_printk_emitter(
             func,
             local_sym_tab,
             struct_sym_tab,
+            local_var_metadata,
         )
     elif isinstance(call.args[0], ast.Constant) and isinstance(call.args[0].value, str):
         # TODO: We are only supporting single arguments for now.
@@ -134,6 +140,7 @@ def bpf_map_update_elem_emitter(
     func,
     local_sym_tab=None,
     struct_sym_tab=None,
+    local_var_metadata=None,
 ):
     """
     Emit LLVM IR for bpf_map_update_elem helper function call.
@@ -175,6 +182,114 @@ def bpf_map_update_elem_emitter(
 
     return result, None
 
+@HelperHandlerRegistry.register("submit")
+def bpf_ringbuf_submit_emitter(
+    call,
+    map_ptr,
+    module,
+    builder,
+    func,
+    local_sym_tab=None,
+    struct_sym_tab=None,
+    local_var_metadata=None,
+):
+    """
+    Emit LLVM IR for bpf_ringbuf_submit helper function call.
+    Expected call signature: ringbuf.submit(data, flags=0)
+    """
+    if not call.args or len(call.args) < 1 or len(call.args) > 2:
+        raise ValueError(
+            "Ringbuf submit expects 1 or 2 args (data, flags), "
+            f"got {len(call.args)}"
+        )
+
+    data_arg = call.args[0]
+    data_ptr = get_or_create_ptr_from_arg(data_arg, builder, local_sym_tab)
+
+    # Get flags argument (default to 0)
+    flags_arg = call.args[1] if len(call.args) > 1 else None
+    flags_val = get_flags_val(flags_arg, builder, local_sym_tab)
+
+    # Returns: void
+    # Args: (void* data, u64 flags)
+    fn_type = ir.FunctionType(
+        ir.VoidType(),
+        [ir.PointerType(), ir.IntType(64)],
+        var_arg=False,
+    )
+    fn_ptr_type = ir.PointerType(fn_type)
+
+    fn_addr = ir.Constant(ir.IntType(64), BPFHelperID.BPF_RINGBUF_SUBMIT.value)
+    fn_ptr = builder.inttoptr(fn_addr, fn_ptr_type)
+
+    if isinstance(flags_val, int):
+        flags_const = ir.Constant(ir.IntType(64), flags_val)
+    else:
+        flags_const = flags_val
+
+    builder.call(fn_ptr, [data_ptr, flags_const], tail=True)
+
+    return None
+
+@HelperHandlerRegistry.register("reserve")
+def bpf_ringbuf_reserve_emitter(
+    call,
+    map_ptr,
+    module,
+    builder,
+    func,
+    local_sym_tab=None,
+    struct_sym_tab=None,
+    local_var_metadata=None,
+):
+    """
+    Emit LLVM IR for bpf_ringbuf_reserve helper function call.
+    Expected call signature: ringbuf.reserve(size, flags=0)
+    """
+    if not call.args or len(call.args) < 1 or len(call.args) > 2:
+        raise ValueError(
+            "Ringbuf reserve expects 1 or 2 args (size, flags), "
+            f"got {len(call.args)}"
+        )
+
+    # TODO: here, getting length of stuff does not actually work. need to fix this.
+    size_arg = call.args[0]
+    if isinstance(size_arg, ast.Constant):
+        size_val = ir.Constant(ir.IntType(64), size_arg.value)
+    elif isinstance(size_arg, ast.Name):
+        if size_arg.id not in local_sym_tab:
+            raise ValueError(
+                f"Variable '{size_arg.id}' not found in local symbol table"
+            )
+        size_val = builder.load(local_sym_tab[size_arg.id])
+    else:
+        raise NotImplementedError(f"Unsupported size argument type: {type(size_arg)}")
+
+    flags_arg = call.args[1] if len(call.args) > 1 else None
+    flags_val = get_flags_val(flags_arg, builder, local_sym_tab)
+
+    map_void_ptr = builder.bitcast(map_ptr, ir.PointerType())
+
+    # Args: (void* ringbuf, u64 size, u64 flags)
+    fn_type = ir.FunctionType(
+        ir.PointerType(),
+        [ir.PointerType(), ir.IntType(64), ir.IntType(64)],
+        var_arg=False,
+    )
+    fn_ptr_type = ir.PointerType(fn_type)
+
+    fn_addr = ir.Constant(ir.IntType(64), BPFHelperID.BPF_RINGBUF_RESERVE.value)
+    fn_ptr = builder.inttoptr(fn_addr, fn_ptr_type)
+
+    if isinstance(flags_val, int):
+        flags_const = ir.Constant(ir.IntType(64), flags_val)
+    else:
+        flags_const = flags_val
+
+    result = builder.call(fn_ptr, [map_void_ptr, size_val, flags_const], tail=True)
+
+    return result, ir.PointerType()
+
 
 @HelperHandlerRegistry.register("delete")
 def bpf_map_delete_elem_emitter(
@@ -185,6 +300,7 @@ def bpf_map_delete_elem_emitter(
     func,
     local_sym_tab=None,
     struct_sym_tab=None,
+    local_var_metadata=None,
 ):
     """
     Emit LLVM IR for bpf_map_delete_elem helper function call.
@@ -222,6 +338,7 @@ def bpf_get_current_pid_tgid_emitter(
     func,
     local_sym_tab=None,
     struct_sym_tab=None,
+    local_var_metadata=None,
 ):
     """
     Emit LLVM IR for bpf_get_current_pid_tgid helper function call.
@@ -248,6 +365,7 @@ def bpf_perf_event_output_handler(
     func,
     local_sym_tab=None,
     struct_sym_tab=None,
+    local_var_metadata=None,
 ):
     if len(call.args) != 1:
         raise ValueError(
@@ -256,7 +374,9 @@ def bpf_perf_event_output_handler(
     data_arg = call.args[0]
     ctx_ptr = func.args[0]  # First argument to the function is ctx
 
-    data_ptr, size_val = get_data_ptr_and_size(data_arg, local_sym_tab, struct_sym_tab)
+    data_ptr, size_val = get_data_ptr_and_size(
+        data_arg, local_sym_tab, struct_sym_tab, local_var_metadata
+    )
 
     # BPF_F_CURRENT_CPU is -1 in 32 bit
     flags_val = ir.Constant(ir.IntType(64), 0xFFFFFFFF)
@@ -294,6 +414,7 @@ def handle_helper_call(
     local_sym_tab=None,
     map_sym_tab=None,
     struct_sym_tab=None,
+    local_var_metadata=None,
 ):
     """Process a BPF helper function call and emit the appropriate LLVM IR."""
 
@@ -312,6 +433,7 @@ def handle_helper_call(
             func,
             local_sym_tab,
             struct_sym_tab,
+            local_var_metadata,
         )
 
     # Handle direct function calls (e.g., print(), ktime())

pythonbpf/helper/helper_utils.py

@@ -37,7 +37,7 @@ class HelperHandlerRegistry:
 def get_var_ptr_from_name(var_name, local_sym_tab):
     """Get a pointer to a variable from the symbol table."""
     if local_sym_tab and var_name in local_sym_tab:
-        return local_sym_tab[var_name].var
+        return local_sym_tab[var_name][0]
     raise ValueError(f"Variable '{var_name}' not found in local symbol table")
 
 
@@ -72,7 +72,7 @@ def get_flags_val(arg, builder, local_sym_tab):
 
     if isinstance(arg, ast.Name):
         if local_sym_tab and arg.id in local_sym_tab:
-            flags_ptr = local_sym_tab[arg.id].var
+            flags_ptr = local_sym_tab[arg.id][0]
             return builder.load(flags_ptr)
         else:
             raise ValueError(f"Variable '{arg.id}' not found in local symbol table")
@@ -100,6 +100,7 @@ def handle_fstring_print(
     func,
     local_sym_tab=None,
     struct_sym_tab=None,
+    local_var_metadata=None,
 ):
     """Handle f-string formatting for bpf_printk emitter."""
     fmt_parts = []
@@ -117,6 +118,7 @@ def handle_fstring_print(
                 exprs,
                 local_sym_tab,
                 struct_sym_tab,
+                local_var_metadata,
             )
         else:
             raise NotImplementedError(f"Unsupported f-string value type: {type(value)}")
@@ -136,6 +138,7 @@ def handle_fstring_print(
             builder,
             local_sym_tab,
             struct_sym_tab,
+            local_var_metadata,
         )
         args.append(arg_value)
 
@@ -155,7 +158,9 @@ def _process_constant_in_fstring(cst, fmt_parts, exprs):
         )
 
 
-def _process_fval(fval, fmt_parts, exprs, local_sym_tab, struct_sym_tab):
+def _process_fval(
+    fval, fmt_parts, exprs, local_sym_tab, struct_sym_tab, local_var_metadata
+):
     """Process formatted values in f-string."""
     logger.debug(f"Processing formatted value: {ast.dump(fval)}")
 
@@ -168,6 +173,7 @@ def _process_fval(fval, fmt_parts, exprs, local_sym_tab, struct_sym_tab):
             exprs,
             local_sym_tab,
             struct_sym_tab,
+            local_var_metadata,
         )
     else:
         raise NotImplementedError(
@@ -178,11 +184,13 @@ def _process_fval(fval, fmt_parts, exprs, local_sym_tab, struct_sym_tab):
 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]
+        _, var_type = 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):
+def _process_attr_in_fval(
+    attr_node, fmt_parts, exprs, local_sym_tab, struct_sym_tab, local_var_metadata
+):
     """Process attribute nodes in formatted values."""
     if (
         isinstance(attr_node.value, ast.Name)
@@ -192,7 +200,12 @@ def _process_attr_in_fval(attr_node, fmt_parts, exprs, local_sym_tab, struct_sym
         var_name = attr_node.value.id
         field_name = attr_node.attr
 
-        var_type = local_sym_tab[var_name].metadata
+        if not local_var_metadata or var_name not in local_var_metadata:
+            raise ValueError(
+                f"Metadata for '{var_name}' not found in local var metadata"
+            )
+
+        var_type = local_var_metadata[var_name]
         if var_type not in struct_sym_tab:
             raise ValueError(
                 f"Struct '{var_type}' for '{var_name}' not in symbol table"
@@ -250,7 +263,9 @@ def _create_format_string_global(fmt_str, func, module, builder):
     return builder.bitcast(fmt_gvar, ir.PointerType())
 
 
-def _prepare_expr_args(expr, func, module, builder, local_sym_tab, struct_sym_tab):
+def _prepare_expr_args(
+    expr, func, module, builder, local_sym_tab, struct_sym_tab, local_var_metadata
+):
     """Evaluate and prepare an expression to use as an arg for bpf_printk."""
     val, _ = eval_expr(
         func,
@@ -260,6 +275,7 @@ def _prepare_expr_args(expr, func, module, builder, local_sym_tab, struct_sym_ta
         local_sym_tab,
         None,
         struct_sym_tab,
+        local_var_metadata,
     )
 
     if val:
@@ -282,26 +298,34 @@ def _prepare_expr_args(expr, func, module, builder, local_sym_tab, struct_sym_ta
         return ir.Constant(ir.IntType(64), 0)
 
 
-def get_data_ptr_and_size(data_arg, local_sym_tab, struct_sym_tab):
+def get_data_ptr_and_size(data_arg, local_sym_tab, struct_sym_tab, local_var_metadata):
     """Extract data pointer and size information for perf event output."""
     if isinstance(data_arg, ast.Name):
         data_name = data_arg.id
         if local_sym_tab and data_name in local_sym_tab:
-            data_ptr = local_sym_tab[data_name].var
+            data_ptr = local_sym_tab[data_name][0]
         else:
             raise ValueError(
                 f"Data variable {data_name} not found in local symbol table."
             )
 
         # Check if data_name is a struct
-        data_type = local_sym_tab[data_name].metadata
+        if local_var_metadata and data_name in local_var_metadata:
+            data_type = local_var_metadata[data_name]
             if data_type in struct_sym_tab:
                 struct_info = struct_sym_tab[data_type]
                 size_val = ir.Constant(ir.IntType(64), struct_info.size)
                 return data_ptr, size_val
             else:
-            raise ValueError(f"Struct {data_type} for {data_name} not in symbol table.")
+                raise ValueError(
+                    f"Struct {data_type} for {data_name} not in symbol table."
+                )
+        else:
+            raise ValueError(
+                f"Metadata for variable {data_name} "
+                "not found in local variable metadata."
+            )
     else:
         raise NotImplementedError(
-            "Only simple object names are supported as data in perf event output."
+            "Only simple object names are supported " "as data in perf event output."
         )

pythonbpf/maps/maps_pass.py

@@ -85,7 +85,7 @@ def create_bpf_map(module, map_name, map_params):
 
 
 def create_map_debug_info(module, map_global, map_name, map_params):
-    """Generate debug info metadata for BPF maps HASH and PERF_EVENT_ARRAY"""
+    """Generate debug information metadata for BPF maps HASH and PERF_EVENT_ARRAY"""
     generator = DebugInfoGenerator(module)
 
     uint_type = generator.get_uint32_type()
@@ -158,8 +158,7 @@ def create_ringbuf_debug_info(module, map_global, map_name, map_params):
     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(
+    max_entries_array = generator.create_array_type(int_type, map_params["max_entries"])
-        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
@@ -167,8 +166,7 @@ def create_ringbuf_debug_info(module, map_global, map_name, map_params):
 
     elements_arr = [type_member, max_entries_member]
 
-    struct_type = generator.create_struct_type(
+    struct_type = generator.create_struct_type(elements_arr, 128, is_distinct=True)
-        elements_arr, 128, is_distinct=True)
 
     global_var = generator.create_global_var_debug_info(
         map_name, struct_type, is_local=False

tests/c-form/ringbuf.bpf.c

@@ -22,27 +22,29 @@ struct {
 SEC("tracepoint/syscalls/sys_enter_execve")
 int trace_execve(void *ctx)
 {
-    struct event *e;
+//    struct event *e;
-    __u64 pid_tgid;
+//    __u64 pid_tgid;
-    __u64 uid_gid;
+//    __u64 uid_gid;
-
+    __u32 *e;
     // Reserve space in the ringbuffer
     e = bpf_ringbuf_reserve(&events, sizeof(*e), 0);
     if (!e)
         return 0;
+//
+//    // Fill the struct with data
+//    pid_tgid = bpf_get_current_pid_tgid();
+//    e->pid = pid_tgid >> 32;
+//
+//    uid_gid = bpf_get_current_uid_gid();
+//    e->uid = uid_gid & 0xFFFFFFFF;
+//
+//    e->timestamp = bpf_ktime_get_ns();
 
-    // Fill the struct with data
+//    bpf_get_current_comm(&e->comm, sizeof(e->comm));
-    pid_tgid = bpf_get_current_pid_tgid();
+//
-    e->pid = pid_tgid >> 32;
+//    // Submit the event to ringbuffer
-
+    __u32 temp = 32;
-    uid_gid = bpf_get_current_uid_gid();
+    e = &temp;
-    e->uid = uid_gid & 0xFFFFFFFF;
-
-    e->timestamp = bpf_ktime_get_ns();
-
-    bpf_get_current_comm(&e->comm, sizeof(e->comm));
-
-    // Submit the event to ringbuffer
     bpf_ringbuf_submit(e, 0);
 
     return 0;

tests/failing_tests/condition_issue.py

@@ -0,0 +1,33 @@
+from pythonbpf import bpf, map, bpfglobal, section, compile, compile_to_ir, BPF
+from pythonbpf.maps import RingBuf
+from ctypes import c_int32, c_void_p
+
+
+# Define a map
+@bpf
+@map
+def mymap() -> RingBuf:
+    return RingBuf(max_entries=(1024))
+
+@bpf
+@section("tracepoint/syscalls/sys_enter_clone")
+def random_section(ctx: c_void_p) -> c_int32:
+    e: c_int32 = mymap().reserve(64)
+    if e == 0:  # here is the issue i think
+        return c_int32(0)
+    mymap().submit(e)
+    return c_int32(0)
+
+
+@bpf
+@bpfglobal
+def LICENSE() -> str:
+    return "GPL"
+
+
+compile_to_ir("ringbuf.py", "ringbuf.ll")
+compile()
+b = BPF()
+b.load_and_attach()
+while True:
+    print("running")

tests/passing_tests/ringbuf.py

@@ -1,5 +1,5 @@
-from pythonbpf import bpf, BPF, map, bpfglobal, section, compile, compile_to_ir
+from pythonbpf import bpf, map, bpfglobal, section, compile, compile_to_ir, BPF
-from pythonbpf.maps import RingBuf, HashMap
+from pythonbpf.maps import RingBuf
 from ctypes import c_int32, c_void_p
 
 
@@ -9,17 +9,13 @@ from ctypes import c_int32, c_void_p
 def mymap() -> RingBuf:
     return RingBuf(max_entries=(1024))
 
-
-@bpf
-@map
-def mymap2() -> HashMap:
-    return HashMap(key=c_int32, value=c_int32, max_entries=1024)
-
-
 @bpf
 @section("tracepoint/syscalls/sys_enter_clone")
 def random_section(ctx: c_void_p) -> c_int32:
     print("Hello")
+    e = mymap().reserve(6)
+    if e:
+        mymap().submit(e)
     return c_int32(0)
 
 
@@ -33,3 +29,5 @@ compile_to_ir("ringbuf.py", "ringbuf.ll")
 compile()
 b = BPF()
 b.load_and_attach()
+while True:
+    print("running")