From: Hugh Sasse <hgs@...>
Date: 2005-11-05T04:45:03+09:00
Subject: Stack trace consumes information. patch...

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I have just had output like this from rails:

/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.11.1/lib/active_record/connection_adapters/mysql_adapter.rb:119:in `query': Duplicate entry '"00149246       "' for key 2 (Mysql::Error)
        from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.11.1/lib/active_record/connection_adapters/mysql_adapter.rb:119:in `execute'
        from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.11.1/lib/active_record/connection_adapters/mysql_adapter.rb:113:in `insert'
        from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.11.1/lib/active_record/base.rb:1155:in `create_without_callbacks'
        from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.11.1/lib/active_record/callbacks.rb:261:in `create_without_timestamps'
        from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.11.1/lib/active_record/timestamp.rb:30:in `create'
        from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.11.1/lib/active_record/base.rb:1139:in `create_or_update_without_callbacks'
        from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.11.1/lib/active_record/callbacks.rb:249:in `create_or_update'
        from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.11.1/lib/active_record/base.rb:965:in `save_without_validation'
         ... 9 levels...
        from /usr/local/lib/ruby/1.8/open-uri.rb:87:in `open'
        from populate_tables2.rb:247:in `initialize'
        from populate_tables2.rb:461:in `new'
        from populate_tables2.rb:461
neelix hgs 13 %>

In those missing 9 levels is the information I need about where my
call to the library was.  I.e. that would tell me which table I was
accessing at the time.

The attached patch puts #ifndef...#endif around the definitions for
TRACE_HEAD and TRACE_TAIL, to give people the option of adding

 -DTRACE_TAIL=40 -DTRACE_HEAD=20

to CPPFLAGS and recompiling ruby if they should wish.

Since these are not defined anywhere else it should not break any
code.

It's untested, but I thought I'd post here to see if it is rejected
outright, before testing it thoroughly...

        Thank you,
        Hugh
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