varun-r-mallya/python-bpf
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generate IR partly

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This commit is contained in:
varun-r-mallya
2025-10-25 04:40:58 +05:30
parent c6b5ecb47e
commit 028d9c2c08
3 changed files with 46 additions and 4 deletions
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26
pythonbpf/vmlinux_parser/vmlinux_exports_handler.py
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@ -97,7 +97,16 @@ class VmlinuxHandler:
globvar_ir, field_data = self.get_field_type(
python_type.__name__, field_name
)
# field_index = self.get_field_index(python_type.__name__, field_name)
offset = builder.load(globvar_ir)
i8_ptr_type = ir.IntType(8).as_pointer()
byte_ptr = builder.bitcast(var_info.var, i8_ptr_type)
print(byte_ptr)
# Step 3: GEP with the offset to get field pointer
field_ptr_i8 = builder.gep(
byte_ptr, [ir.Constant(ir.IntType(32), 0), offset], inbounds=False
)
print(field_ptr_i8)
# Return pointer to field and field type
return None
else:
@ -122,3 +131,18 @@ class VmlinuxHandler:
)
else:
raise ValueError(f"{vmlinux_struct_name} is not a vmlinux struct")
def get_field_index(self, vmlinux_struct_name, field_name):
"""Get the type of a field in a vmlinux struct"""
if self.is_vmlinux_struct(vmlinux_struct_name):
python_type = self.vmlinux_symtab[vmlinux_struct_name]["python_type"]
if hasattr(python_type, field_name):
return list(
self.vmlinux_symtab[vmlinux_struct_name]["members"].keys()
).index(field_name)
else:
raise ValueError(
f"Field {field_name} not found in vmlinux struct {vmlinux_struct_name}"
)
else:
raise ValueError(f"{vmlinux_struct_name} is not a vmlinux struct")