2007-11-20 Masami Hiramatsu <mhiramat@redhat.com>

        PR 4935.
        * parse.cxx (parser::parse_probe_point): Parse "if" condition
        following probe point.
        * staptree.h (probe_point): Add "condition" field.
        (probe): Add "condition" field and "add_condition" method.
        (deep_copy_visitor): Add "deep_copy" method for the expression.
        * staptree.cxx (probe_point::probe_point): Initalize it.
        (probe::add_condition): Implement it.
        (probe::print): Output "condition" field.
        (probe::str): Ditto.
        (deep_copy_visitor::deep_copy): Implement it.
        * elaborate.h (derived_probe): Add "insert_condition_statement"
        method.
        * elaborate.cxx (derived_probe::derived_probe): Initialize "condition"
        field, and insert a condition check routine on the top of body.
        (derived_probe::insert_condition_statement): Implement it.
        (alias_expansion_builder::build): Pass the condition from the alias
        referer to new alias.
        * tapsets.cxx (be_derived_probe): Remove unused constructor.
        (dwarf_derived_probe::dwarf_derived_probe): Insert a condition check
        routine on the top of body.
        (mark_derived_probe::mark_derived_probe): Ditto.
        (mark_builder::build): Pass the base location to mark_derived_probe.

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