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Add process_perf_event_map

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Pragyansh Chaturvedi
2025-09-20 02:10:11 +05:30
parent b0f18229d9
commit 69d0cf2e0e
1 changed files with 25 additions and 3 deletions
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28
pythonbpf/maps_pass.py
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@ -36,7 +36,8 @@ def create_bpf_map(module, map_name, map_params):
map_global = ir.GlobalVariable(module, map_struct_type, name=map_name) map_global = ir.GlobalVariable(module, map_struct_type, name=map_name)
map_global.linkage = 'dso_local' map_global.linkage = 'dso_local'
map_global.global_constant = False map_global.global_constant = False
map_global.initializer = ir.Constant(map_struct_type, None) # type: ignore map_global.initializer = ir.Constant(
map_struct_type, None) # type: ignore
map_global.section = ".maps" map_global.section = ".maps"
map_global.align = 8 # type: ignore map_global.align = 8 # type: ignore
@ -47,6 +48,7 @@ def create_bpf_map(module, map_name, map_params):
map_sym_tab[map_name] = map_global map_sym_tab[map_name] = map_global
return map_global return map_global
def create_map_debug_info(module, map_global, map_name, map_params): def create_map_debug_info(module, map_global, map_name, map_params):
"""Generate debug information metadata for BPF map""" """Generate debug information metadata for BPF map"""
file_metadata = module._file_metadata file_metadata = module._file_metadata
@ -74,8 +76,9 @@ def create_map_debug_info(module, map_global, map_name, map_params):
"size": 32, "size": 32,
"elements": [array_subrange] "elements": [array_subrange]
}) })
array_subrange_max_entries = module.add_debug_info("DISubrange", {"count": map_params["max_entries"]}) array_subrange_max_entries = module.add_debug_info(
"DISubrange", {"count": map_params["max_entries"]})
array_type_max_entries = module.add_debug_info("DICompositeType", { array_type_max_entries = module.add_debug_info("DICompositeType", {
"tag": dc.DW_TAG_array_type, "tag": dc.DW_TAG_array_type,
"baseType": uint_type, "baseType": uint_type,
@ -204,6 +207,25 @@ def process_hash_map(map_name, rval, module):
return create_bpf_map(module, map_name, map_params) return create_bpf_map(module, map_name, map_params)
def process_perf_event_map(map_name, rval, module):
print(f"Creating PerfEventArray map: {map_name}")
map_params = {"map_type": "PERF_EVENT_ARRAY"}
if len(rval.args) >= 1 and isinstance(rval.args[0], ast.Name):
map_params["key_type"] = rval.args[0].id
if len(rval.args) >= 2 and isinstance(rval.args[1], ast.Name):
map_params["value_type"] = rval.args[1].id
for keyword in rval.keywords:
if keyword.arg == "key_type" and isinstance(keyword.value, ast.Name):
map_params["key_type"] = keyword.value.id
elif keyword.arg == "value_type" and isinstance(keyword.value, ast.Name):
map_params["value_type"] = keyword.value.id
print(f"Map parameters: {map_params}")
return create_bpf_map(module, map_name, map_params)
def process_bpf_map(func_node, module): def process_bpf_map(func_node, module):
"""Process a BPF map (a function decorated with @map)""" """Process a BPF map (a function decorated with @map)"""
map_name = func_node.name map_name = func_node.name