|
| 1 | +import logging |
| 2 | +from llvmlite import ir |
| 3 | + |
| 4 | +from pythonbpf.vmlinux_parser.assignment_info import AssignmentType |
| 5 | + |
| 6 | +logger = logging.getLogger(__name__) |
| 7 | + |
| 8 | + |
| 9 | +class VmlinuxHandler: |
| 10 | + """Handler for vmlinux-related operations""" |
| 11 | + |
| 12 | + _instance = None |
| 13 | + |
| 14 | + @classmethod |
| 15 | + def get_instance(cls): |
| 16 | + """Get the singleton instance""" |
| 17 | + if cls._instance is None: |
| 18 | + logger.warning("VmlinuxHandler used before initialization") |
| 19 | + return None |
| 20 | + return cls._instance |
| 21 | + |
| 22 | + @classmethod |
| 23 | + def initialize(cls, vmlinux_symtab): |
| 24 | + """Initialize the handler with vmlinux symbol table""" |
| 25 | + cls._instance = cls(vmlinux_symtab) |
| 26 | + return cls._instance |
| 27 | + |
| 28 | + def __init__(self, vmlinux_symtab): |
| 29 | + """Initialize with vmlinux symbol table""" |
| 30 | + self.vmlinux_symtab = vmlinux_symtab |
| 31 | + logger.info( |
| 32 | + f"VmlinuxHandler initialized with {len(vmlinux_symtab) if vmlinux_symtab else 0} symbols" |
| 33 | + ) |
| 34 | + |
| 35 | + def is_vmlinux_enum(self, name): |
| 36 | + """Check if name is a vmlinux enum constant""" |
| 37 | + return ( |
| 38 | + name in self.vmlinux_symtab |
| 39 | + and self.vmlinux_symtab[name]["value_type"] == AssignmentType.CONSTANT |
| 40 | + ) |
| 41 | + |
| 42 | + def is_vmlinux_struct(self, name): |
| 43 | + """Check if name is a vmlinux struct""" |
| 44 | + return ( |
| 45 | + name in self.vmlinux_symtab |
| 46 | + and self.vmlinux_symtab[name]["value_type"] == AssignmentType.STRUCT |
| 47 | + ) |
| 48 | + |
| 49 | + def handle_vmlinux_enum(self, name): |
| 50 | + """Handle vmlinux enum constants by returning LLVM IR constants""" |
| 51 | + if self.is_vmlinux_enum(name): |
| 52 | + value = self.vmlinux_symtab[name]["value"] |
| 53 | + logger.info(f"Resolving vmlinux enum {name} = {value}") |
| 54 | + return ir.Constant(ir.IntType(64), value), ir.IntType(64) |
| 55 | + return None |
| 56 | + |
| 57 | + def handle_vmlinux_struct(self, struct_name, module, builder): |
| 58 | + """Handle vmlinux struct initializations""" |
| 59 | + if self.is_vmlinux_struct(struct_name): |
| 60 | + # TODO: Implement core-specific struct handling |
| 61 | + # This will be more complex and depends on the BTF information |
| 62 | + logger.info(f"Handling vmlinux struct {struct_name}") |
| 63 | + # Return struct type and allocated pointer |
| 64 | + # This is a stub, actual implementation will be more complex |
| 65 | + return None |
| 66 | + return None |
| 67 | + |
| 68 | + def handle_vmlinux_struct_field( |
| 69 | + self, struct_var_name, field_name, module, builder, local_sym_tab |
| 70 | + ): |
| 71 | + """Handle access to vmlinux struct fields""" |
| 72 | + # Check if it's a variable of vmlinux struct type |
| 73 | + if struct_var_name in local_sym_tab: |
| 74 | + var_info = local_sym_tab[struct_var_name] |
| 75 | + # Need to check if this variable is a vmlinux struct |
| 76 | + # This will depend on how you track vmlinux struct types in your symbol table |
| 77 | + logger.info( |
| 78 | + f"Attempting to access field {field_name} of possible vmlinux struct {struct_var_name}" |
| 79 | + ) |
| 80 | + # Return pointer to field and field type |
| 81 | + return None |
| 82 | + return None |
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