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Advice needed on when to synthesize <sym>.high_bound in ld
- To: binutils at sources dot redhat dot com
- Subject: Advice needed on when to synthesize <sym>.high_bound in ld
- From: Greg McGary <greg at mcgary dot org>
- Date: Fri, 25 Aug 2000 17:34:31 -0700
For bounded pointers (see http://gcc.gnu.org/projects/bp/main.html),
gcc emits a reference to a symbol named `foo.high_bound' if it doesn't
have enough information to determine the size of `foo'. This happens
often for extern arrays and extern instances of incomplete struct types.
At link time, I wish to synthesize definitions for symbols with a
`.high_bound' suffix when the real size is known. For ELF (and mostly
what I care about), this is easy since all data & common symbol table
entries have sizes.
What's the best time to do this? Should I make a separate pass prior
to ldwrite looking for undefined .high_bound symbols and create
definitions for them. Or, should I proceed with ldwrite, and
create just-in-time definions for undefined .high_bound symbols.
Are there other alternatives I haven't considered?
Thanks,
Greg