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Fix printk handler to comply with new symtab convention

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This commit is contained in:
Pragyansh Chaturvedi
2025-09-26 01:02:10 +05:30
parent 51595f9ec2
commit ee03ac04d0
4 changed files with 10 additions and 9 deletions
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4
pythonbpf/bpf_helper_handler.py
View File

@ -121,7 +121,8 @@ def bpf_printk_emitter(call, map_ptr, module, builder, func, local_sym_tab=None,
"Warning: bpf_printk supports up to 3 arguments, extra arguments will be ignored.")
for expr in exprs[:3]:
val = eval_expr(func, module, builder, expr, local_sym_tab, None)
val, _ = eval_expr(func, module, builder,
expr, local_sym_tab, None)
if val:
if isinstance(val.type, ir.PointerType):
val = builder.ptrtoint(val, ir.IntType(64))
@ -137,7 +138,6 @@ def bpf_printk_emitter(call, map_ptr, module, builder, func, local_sym_tab=None,
print(
"Warning: Failed to evaluate expression for bpf_printk argument. It will be converted to 0.")
args.append(ir.Constant(ir.IntType(64), 0))
fn_type = ir.FunctionType(ir.IntType(
64), [ir.PointerType(), ir.IntType(32)], var_arg=True)
fn_ptr_type = ir.PointerType(fn_type)

2
pythonbpf/codegen.py
View File

@ -93,6 +93,7 @@ def compile_to_ir(filename: str, output: str):
module.add_named_metadata("llvm.ident", ["llvmlite PythonBPF v0.0.1"])
print(f"IR written to {output}")
with open(output, "w") as f:
f.write(f"source_filename = \"{filename}\"\n")
f.write(str(module))
@ -118,6 +119,7 @@ def compile():
print(f"Object written to {o_file}, {ll_file} can be removed")
def BPF() -> BpfProgram:
caller_frame = inspect.stack()[1]
caller_file = Path(caller_frame.filename).resolve()

2
pythonbpf/expr_pass.py
View File

@ -3,7 +3,7 @@ from llvmlite import ir
def eval_expr(func, module, builder, expr, local_sym_tab, map_sym_tab, structs_sym_tab=None, local_var_metadata=None):
print(f"Evaluating expression: {expr}")
print(f"Evaluating expression: {ast.dump(expr)}")
if isinstance(expr, ast.Name):
if expr.id in local_sym_tab:
var = local_sym_tab[expr.id][0]

9
pythonbpf/functions_pass.py
View File

@ -61,7 +61,7 @@ def handle_assign(func, module, builder, stmt, map_sym_tab, local_sym_tab, struc
if val is None:
print("Failed to evaluate struct field assignment")
return
builder.store(val, field_ptr)
builder.store(val[0], field_ptr)
print(f"Assigned to struct field {var_name}.{field_name}")
return
elif isinstance(rval, ast.Constant):
@ -114,7 +114,7 @@ def handle_assign(func, module, builder, stmt, map_sym_tab, local_sym_tab, struc
# var.align = 8
val = handle_helper_call(
rval, module, builder, func, local_sym_tab, map_sym_tab, structs_sym_tab, local_var_metadata)
builder.store(val, local_sym_tab[var_name][0])
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:
@ -125,7 +125,7 @@ def handle_assign(func, module, builder, stmt, map_sym_tab, local_sym_tab, struc
print("Failed to evaluate deref argument")
return
print(f"Dereferenced value: {val}, storing in {var_name}")
builder.store(val, local_sym_tab[var_name][0])
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:
@ -155,7 +155,7 @@ def handle_assign(func, module, builder, stmt, map_sym_tab, local_sym_tab, struc
rval, module, builder, func, 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, local_sym_tab[var_name][0])
builder.store(val[0], local_sym_tab[var_name][0])
# local_sym_tab[var_name] = var
else:
print("Unsupported assignment call structure")
@ -462,7 +462,6 @@ def process_bpf_chunk(func_node, module, return_type, map_sym_tab, structs_sym_t
process_func_body(module, builder, func_node, func,
ret_type, map_sym_tab, structs_sym_tab)
return func