varun-r-mallya/python-bpf
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add dwarf behaviour conditions

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varun-r-mallya
2025-09-30 20:26:38 +05:30
parent 6afcffb4ed
commit ce9be8750d
1 changed files with 12 additions and 11 deletions
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23
pythonbpf/codegen.py
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@ -15,6 +15,7 @@ import tempfile
VERSION = "v0.1.3"
def find_bpf_chunks(tree):
"""Find all functions decorated with @bpf in the AST."""
bpf_functions = []
@ -52,14 +53,14 @@ def compile_to_ir(filename: str, output: str):
module.triple = "bpf"
if not hasattr(module, '_debug_compile_unit'):
module._file_metadata = module.add_debug_info("DIFile", { # type: ignore
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
module._debug_compile_unit = module.add_debug_info("DICompileUnit", { # type: ignore
"language": DW_LANG_C11,
"file": module._file_metadata, # type: ignore
"producer": f"PythonBPF {VERSION}",
"isOptimized": True,
"runtimeVersion": 0,
@ -69,25 +70,25 @@ def compile_to_ir(filename: str, output: str):
}, is_distinct=True)
module.add_named_metadata(
"llvm.dbg.cu", module._debug_compile_unit) # type: ignore
"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 = module.add_metadata([DwarfBehaviorEnum.ERROR_IF_MISMATCH,
"wchar_size",
ir.Constant(ir.IntType(32), 4)])
frame_pointer = module.add_metadata([ir.Constant(ir.IntType(32), 7),
frame_pointer = module.add_metadata([DwarfBehaviorEnum.OVERRIDE_USE_LARGEST,
"frame-pointer",
ir.Constant(ir.IntType(32), 2)])
# Add Debug Info Version (3 = DWARF v3, which LLVM expects)
debug_info_version = module.add_metadata([ir.Constant(ir.IntType(32), 2),
debug_info_version = module.add_metadata([DwarfBehaviorEnum.WARNING_IF_MISMATCH,
"Debug Info Version",
ir.Constant(ir.IntType(32), 3)])
# Add explicit DWARF version (4 is common, works with LLVM BPF backend)
dwarf_version = module.add_metadata([ir.Constant(ir.IntType(32), 2),
# Add explicit DWARF version 5
dwarf_version = module.add_metadata([DwarfBehaviorEnum.OVERRIDE_USE_LARGEST,
"Dwarf Version",
ir.Constant(ir.IntType(32), 4)])
ir.Constant(ir.IntType(32), 5)])
module.add_named_metadata("llvm.module.flags", wchar_size)
module.add_named_metadata("llvm.module.flags", frame_pointer)