>>>>> "Simon" == Simon Marchi <[email protected]> writes:
Simon> Just to make sure I understand, can you clarify how
Simon> DW_AT_data_member_location and DW_AT_bit_offset are used in this
Simon> case? In particular, which one is constant and which one is an
Simon> evaluated expression?
Dynamic DW_AT_data_member_location, static DW_AT_bit_offset:
<5><117a>: Abbrev Number: 17 (DW_TAG_member)
<117b> DW_AT_name : (indirect string, offset: 0x1959):
another_field
...
<1188> DW_AT_bit_offset : 6
<1189> DW_AT_data_member_location: 6 byte block: 99 3d 1 0 0 22
(DW_OP_call4: <0x1193>; DW_OP_plus)
...
<3><1193>: Abbrev Number: 2 (DW_TAG_dwarf_procedure)
<1194> DW_AT_location : 15 byte block: 97 94 1 37 1a 32 1e 23 7 38 1b
31 1c 23 3 (DW_OP_push_object_address; DW_OP_deref_size: 1; DW_OP_lit7;
DW_OP_and; DW_OP_lit2; DW_OP_mul; DW_OP_plus_uconst: 7; DW_OP_lit8; DW_OP_div;
DW_OP_lit1; DW_OP_minus; DW_OP_plus_uconst: 3)
This comes from the description of this gdb patch, which includes a test
case. (However, you'd need a patched GCC to get this output.)
https://sourceware.org/pipermail/gdb-patches/2025-April/217289.html
Tom
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