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Add a llvm-dwarfdump inspired --debug-info [OFFSET] argument to dwarfdump. #776

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Merged
merged 2 commits into from
Jun 30, 2025
Merged

Add a llvm-dwarfdump inspired --debug-info [OFFSET] argument to dwarfdump. #776

merged 2 commits into from
Jun 30, 2025

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khuey
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@khuey khuey commented Jun 28, 2025

This dumps only .debug_info and if the optional offset is provided only the subtree of DIEs starting at that offset.

This relies on the way parallel_output() outputs each unit to its own individual buffer that can be discarded partway through. Implementing it for .debug_types isn't possible at the moment because dump_types() outputs directly to stdout.

@khuey
Add a llvm-dwarfdump inspired --debug-info [OFFSET] argument to dwarf…
1544794 
…dump.

This dumps only .debug_info and if the optional offset is provided only
the subtree of DIEs starting at that offset.

This relies on the way parallel_output() outputs each unit to its own individual buffer
that can be discarded partway through. Implementing it for .debug_types isn't possible
at the moment because dump_types() outputs directly to stdout.
@khuey
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khuey commented Jun 28, 2025

Example output:

khuey@zhadum:~/dev/gimli$ ./target/debug/dwarfdump --debug-info=0x0000015b -G target/debug/dwarfdump

.debug_info

UNIT<.debug_info+0x00000000>: length = 0x36e, format = Dwarf32, version = 4, address_size = 8, abbrev_offset = 0x0
< 3><0x0000015b GOFF=0x0000015b>  DW_TAG_structure_type
                                    DW_AT_name                  PhantomData<core::hash::sip::Sip13Rounds>
                                    DW_AT_byte_size             0x00000000
                                    DW_AT_accessibility         DW_ACCESS_public
                                    DW_AT_alignment             0x00000001
< 4><0x00000163 GOFF=0x00000163>    DW_TAG_template_type_parameter
                                      DW_AT_type                  0x00000113<.debug_info+0x00000113>
                                      DW_AT_name                  T
< 4><0x0000016c GOFF=0x0000016c>    DW_TAG_null
< 3><0x0000016d GOFF=0x0000016d>  DW_TAG_null

philipc
philipc reviewed Jun 29, 2025
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@khuey khuey requested a review from philipc June 29, 2025 13:33
@philipc philipc merged commit 1ab93f1 into gimli-rs:master Jun 30, 2025
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@khuey
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khuey commented Jul 1, 2025

Thanks!

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