add vmlinux expressions to eval expr

pythonbpf/vmlinux_parser/vmlinux_exports_handler.py

@@ -0,0 +1,82 @@
+import logging
+from llvmlite import ir
+
+from pythonbpf.vmlinux_parser.assignment_info import AssignmentType
+
+logger = logging.getLogger(__name__)
+
+
+class VmlinuxHandler:
+    """Handler for vmlinux-related operations"""
+
+    _instance = None
+
+    @classmethod
+    def get_instance(cls):
+        """Get the singleton instance"""
+        if cls._instance is None:
+            logger.warning("VmlinuxHandler used before initialization")
+            return None
+        return cls._instance
+
+    @classmethod
+    def initialize(cls, vmlinux_symtab):
+        """Initialize the handler with vmlinux symbol table"""
+        cls._instance = cls(vmlinux_symtab)
+        return cls._instance
+
+    def __init__(self, vmlinux_symtab):
+        """Initialize with vmlinux symbol table"""
+        self.vmlinux_symtab = vmlinux_symtab
+        logger.info(
+            f"VmlinuxHandler initialized with {len(vmlinux_symtab) if vmlinux_symtab else 0} symbols"
+        )
+
+    def is_vmlinux_enum(self, name):
+        """Check if name is a vmlinux enum constant"""
+        return (
+            name in self.vmlinux_symtab
+            and self.vmlinux_symtab[name]["value_type"] == AssignmentType.CONSTANT
+        )
+
+    def is_vmlinux_struct(self, name):
+        """Check if name is a vmlinux struct"""
+        return (
+            name in self.vmlinux_symtab
+            and self.vmlinux_symtab[name]["value_type"] == AssignmentType.STRUCT
+        )
+
+    def handle_vmlinux_enum(self, name):
+        """Handle vmlinux enum constants by returning LLVM IR constants"""
+        if self.is_vmlinux_enum(name):
+            value = self.vmlinux_symtab[name]["value"]
+            logger.info(f"Resolving vmlinux enum {name} = {value}")
+            return ir.Constant(ir.IntType(64), value), ir.IntType(64)
+        return None
+
+    def handle_vmlinux_struct(self, struct_name, module, builder):
+        """Handle vmlinux struct initializations"""
+        if self.is_vmlinux_struct(struct_name):
+            # TODO: Implement core-specific struct handling
+            # This will be more complex and depends on the BTF information
+            logger.info(f"Handling vmlinux struct {struct_name}")
+            # Return struct type and allocated pointer
+            # This is a stub, actual implementation will be more complex
+            return None
+        return None
+
+    def handle_vmlinux_struct_field(
+        self, struct_var_name, field_name, module, builder, local_sym_tab
+    ):
+        """Handle access to vmlinux struct fields"""
+        # Check if it's a variable of vmlinux struct type
+        if struct_var_name in local_sym_tab:
+            var_info = local_sym_tab[struct_var_name]
+            # Need to check if this variable is a vmlinux struct
+            # This will depend on how you track vmlinux struct types in your symbol table
+            logger.info(
+                f"Attempting to access field {field_name} of possible vmlinux struct {struct_var_name}"
+            )
+            # Return pointer to field and field type
+            return None
+        return None