[Dwarf-discuss] null entry after DW_TAG_compile_unit?
Tue Dec 19 10:35:49 GMT 2006
I have question about a small detail. It concerns the termination of DIE
sibling chains at the highest level of a compilation unit.
For one compilation unit, DWARF 3, paragraph 7.5, states:
Each such contribution consists of a compilation unit header (see
Section 7.5.1) followed by a single DW_TAG_compile_unit or
DW_TAG_partial_unit debugging information entry, together with its
So only one TAG should appear at the highest level.
In all objects I have seen so far this is the case, and no null entry
follows the DW_TAG_compile_unit. This seems correct because the standard
specifies only one entry can occur and a null entry counts for one as well.
When writing a parser, the top level looks to have the same form as
child-DIE-chains. So when parsing using recursive descend, one would
expect the top-tag-chain to be zero terminated to signal the end of the
The question now is, is it valid to have a null entry following that
DW_TAG_compile_unit? Or is that in violation with the debug format
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