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make dwarf constant handling easier

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varun-r-mallya
2025-09-09 13:37:50 +05:30
parent 896daddf0b
commit e0385759b2
3 changed files with 760 additions and 13 deletions
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25
pythonbpf/maps_pass.py
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@ -1,6 +1,7 @@
import ast
from llvmlite import ir
from .type_deducer import ctypes_to_ir
from . import dwarf_constants as dc
map_sym_tab = {}
@ -55,20 +56,20 @@ def create_map_debug_info(module, map_global, map_name, map_params):
uint_type = module.add_debug_info("DIBasicType", {
"name": "unsigned int",
"size": 32,
"encoding": 7
"encoding": dc.DW_ATE_unsigned
})
# Create basic type for unsigned long long (64-bit)
ulong_type = module.add_debug_info("DIBasicType", {
"name": "unsigned long long",
"size": 64,
"encoding": 7 # "DW_ATE_unsigned"
"encoding": dc.DW_ATE_unsigned
})
# Create array type for map type field (array of 1 unsigned int)
array_subrange = module.add_debug_info("DISubrange", {"count": 1})
array_type = module.add_debug_info("DICompositeType", {
"tag": 1, # "DW_TAG_array_type"
"tag": dc.DW_TAG_array_type,
"baseType": uint_type,
"size": 32,
"elements": [array_subrange]
@ -76,25 +77,25 @@ def create_map_debug_info(module, map_global, map_name, map_params):
# Create pointer types
type_ptr = module.add_debug_info("DIDerivedType", {
"tag": 15, # DW_TAG_pointer_type
"tag": dc.DW_TAG_pointer_type,
"baseType": array_type,
"size": 64
})
max_entries_ptr = module.add_debug_info("DIDerivedType", {
"tag": 15, # DW_TAG_pointer_type
"tag": dc.DW_TAG_pointer_type,
"baseType": array_type,
"size": 64
})
key_ptr = module.add_debug_info("DIDerivedType", {
"tag": 15, # DW_TAG_pointer_type
"tag": dc.DW_TAG_pointer_type,
"baseType": uint_type, # Adjust based on actual key type
"size": 64
})
value_ptr = module.add_debug_info("DIDerivedType", {
"tag": 15, # DW_TAG_pointer_type
"tag": dc.DW_TAG_pointer_type,
"baseType": ulong_type, # Adjust based on actual value type
"size": 64
})
@ -102,7 +103,7 @@ def create_map_debug_info(module, map_global, map_name, map_params):
# Create struct members
# scope field does not appear for some reason
type_member = module.add_debug_info("DIDerivedType", {
"tag": 13, # "DW_TAG_member"
"tag": dc.DW_TAG_member,
"name": "type",
"file": file_metadata, # Use the stored file metadata
"baseType": type_ptr,
@ -111,7 +112,7 @@ def create_map_debug_info(module, map_global, map_name, map_params):
})
max_entries_member = module.add_debug_info("DIDerivedType", {
"tag": 13, # DW_TAG_member
"tag": dc.DW_TAG_member,
"name": "max_entries",
"file": file_metadata,
"baseType": max_entries_ptr,
@ -120,7 +121,7 @@ def create_map_debug_info(module, map_global, map_name, map_params):
})
key_member = module.add_debug_info("DIDerivedType", {
"tag": 13, # DW_TAG_member
"tag": dc.DW_TAG_member,
"name": "key",
"file": file_metadata,
"baseType": key_ptr,
@ -129,7 +130,7 @@ def create_map_debug_info(module, map_global, map_name, map_params):
})
value_member = module.add_debug_info("DIDerivedType", {
"tag": 13, # DW_TAG_member
"tag": dc.DW_TAG_member,
"name": "value",
"file": file_metadata,
"baseType": value_ptr,
@ -139,7 +140,7 @@ def create_map_debug_info(module, map_global, map_name, map_params):
# Create the struct type
struct_type = module.add_debug_info("DICompositeType", {
"tag": 19, # DW_TAG_structure_type
"tag": dc.DW_TAG_structure_type,
"file": file_metadata,
"size": 256, # 4 * 64-bit pointers
"elements": [type_member, max_entries_member, key_member, value_member]