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feat:non struct field values can be cast

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varun-r-mallya
2025-11-26 14:18:40 +05:30
parent 7b7b00dbe7
commit 4905649700
5 changed files with 103 additions and 10 deletions
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15
pythonbpf/vmlinux_parser/vmlinux_exports_handler.py
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@ -121,7 +121,12 @@ class VmlinuxHandler:
# Use bpf_probe_read_kernel for non-context struct field access
field_value = self.load_struct_field(
builder, struct_ptr, globvar_ir, field_data, struct_name
builder,
struct_ptr,
globvar_ir,
field_data,
struct_name,
local_sym_tab,
)
# Return field value and field type
return field_value, field_data
@ -130,7 +135,12 @@ class VmlinuxHandler:
@staticmethod
def load_struct_field(
builder, struct_ptr_int, offset_global, field_data, struct_name=None
builder,
struct_ptr_int,
offset_global,
field_data,
struct_name=None,
local_sym_tab=None,
):
"""
Generate LLVM IR to load a field from a regular (non-context) struct using bpf_probe_read_kernel.
@ -204,6 +214,7 @@ class VmlinuxHandler:
logger.warning("Complex vmlinux field type, using default 64 bits")
# Allocate local storage for the field value
# TODO: CRITICAL BUG. alloca cannot be used anywhere other than the basic block
local_storage = builder.alloca(ir.IntType(int_width))
local_storage_i8_ptr = builder.bitcast(local_storage, i8_ptr_type)