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Support for DW_OP_WASM_location #500

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merged 1 commit into from
Sep 10, 2023
Merged

Support for DW_OP_WASM_location #500

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16 changes: 16 additions & 0 deletions elftools/dwarf/dwarf_expr.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@
from io import BytesIO

from ..common.utils import struct_parse, bytelist2string, read_blob
from ..common.exceptions import DWARFError


# DWARF expression opcodes. name -> opcode mapping
Expand Down Expand Up @@ -84,6 +85,7 @@
DW_OP_reinterpret=0xa9,
DW_OP_lo_user=0xe0,
DW_OP_GNU_push_tls_address=0xe0,
DW_OP_WASM_location=0xed,
DW_OP_GNU_implicit_pointer=0xf2,
DW_OP_GNU_entry_value=0xf3,
DW_OP_GNU_const_type=0xf4,
Expand Down Expand Up @@ -196,6 +198,19 @@ def parse_blob():
# ULEB128 with datatype DIE offset, then byte, then a blob of that size
def parse_typedblob():
return lambda stream: [struct_parse(structs.Dwarf_uleb128(''), stream), read_blob(stream, struct_parse(structs.Dwarf_uint8(''), stream))]

# https://yurydelendik.github.io/webassembly-dwarf/
# Byte, then variant: 0, 1, 2 => uleb128, 3 => uint32
def parse_wasmloc():
def parse(stream):
op = struct_parse(structs.Dwarf_uint8(''), stream)
if 0 <= op <= 2:
return [op, struct_parse(structs.Dwarf_uleb128(''), stream)]
elif op == 3:
return [op, struct_parse(structs.Dwarf_uint32(''), stream)]
else:
raise DWARFError("Unknown operation code in DW_OP_WASM_location: %d" % (op,))
return parse

add('DW_OP_addr', parse_op_addr())
add('DW_OP_addrx', parse_arg_struct(structs.Dwarf_uleb128('')))
Expand Down Expand Up @@ -263,5 +278,6 @@ def parse_typedblob():
structs.Dwarf_sleb128('')))
add('DW_OP_GNU_parameter_ref', parse_arg_struct(structs.Dwarf_offset('')))
add('DW_OP_GNU_convert', parse_arg_struct(structs.Dwarf_uleb128('')))
add('DW_OP_WASM_location', parse_wasmloc())

return table