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David Anderson, September 20, 2010
Updated July 22, 2018
The dwarfgen application is intended as both a vehicle
for testing dwarf-generation by libdwarf and as an example
of how one uses libdwarf to generate DWARF.
In addition, it should be useful as a test vehicle for
evaluating future changes to the DWARF standard.
It is necessary as a test-vehicle so that the libdwarf
producer code can be updated to allow more recent features
of DWARF to be supported while trying to guarantee current
producer code users are correctly supported.
By default dwarfgen produces a fake a.out. By that we mean
that no relocation sections are written. Instead, relocations
are processed directly by dwarfgen.
Perhaps at some point a more a.out-like output will be optionally
supported.
In its 2018 form the code calling producer functions
leaks memory as the return values usually need to be
dealloc'd, but only after the code is generated.
An example from -fsanitize=
is
Direct leak of 2688 byte(s) in 28 object(s) allocated from:
#0 0x7f51fb2f9602 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)
#1 0x5873d9 in _dwarf_p_get_alloc /home/davea/dwarf/regressiontests/../code/libdwarf/pro_alloc.c:76
#2 0x55cdaa in dwarf_add_AT_any_value_uleb /home/davea/dwarf/regressiontests/../code/libdwarf/pro_forms.c:1277
#3 0x495d4a in AddAttrToDie(Dwarf_P_Debug_s*, IRepresentation&, IRCUdata&, Dwarf_P_Die_s*, IRDie&, IRAttr&) /home/davea/dwarf/regressiontests/../code/dwarfgen/irepattrtodbg.cc:176
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