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dwarf constant handling #3

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Merged
merged 2 commits into from
Sep 9, 2025
Merged

dwarf constant handling #3

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896dadd
change debug_compile_unit addition location
varun-r-mallya Sep 9, 2025
e038575
make dwarf constant handling easier
varun-r-mallya Sep 9, 2025
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1 change: 0 additions & 1 deletion examples/execve2.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,6 @@
def last() -> HashMap:
return HashMap(key_type=c_uint64, value_type=c_uint64, max_entries=1)


@bpf
@section("tracepoint/syscalls/sys_enter_execve")
def hello(ctx: c_void_p) -> c_int32:
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21 changes: 21 additions & 0 deletions pythonbpf/codegen.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
from .functions_pass import func_proc
from .maps_pass import maps_proc
from .globals_pass import globals_processing
import os


def find_bpf_chunks(tree):
Expand Down Expand Up @@ -41,7 +42,27 @@ def compile_to_ir(filename: str, output: str):
module.data_layout = "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128"
module.triple = "bpf"

if not hasattr(module, '_debug_compile_unit'):
module._file_metadata = module.add_debug_info("DIFile", { # type: ignore
"filename": filename,
"directory": os.path.dirname(filename)
})

module._debug_compile_unit = module.add_debug_info("DICompileUnit", { # type: ignore
"language": 29, # DW_LANG_C11
"file": module._file_metadata, # type: ignore
"producer": "PythonBPF DSL Compiler",
"isOptimized": True,
"runtimeVersion": 0,
"emissionKind": 1,
"splitDebugInlining": False,
"nameTableKind": 0
}, is_distinct=True)

module.add_named_metadata("llvm.dbg.cu", module._debug_compile_unit) # type: ignore

processor(source, filename, module)

wchar_size = module.add_metadata([ir.Constant(ir.IntType(32), 1),
"wchar_size",
ir.Constant(ir.IntType(32), 4)])
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