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We need to poison the false case of valid "@defined(x)?x:y", so we know
that the @defined is correctly leading to the true case only.
* testsuite/semok/thirtysix.stp: poison false in valid cases.
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* tapsets.cxx (var_expanding_visitor::visit_defined_op): If no error was
raised or replacement made on a target_symbol, then its @defined state
is still indeterminate. Some later pass (like @cast) might handle it.
* elaborate.cxx (const_folder::visit_defined_op): Squash any escapees.
* testsuite/semok/thirtysix.stp: Add more variants.
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We now check validity *before* the entry-probe is generated, so invalid
$vars have a chance to be properly optimized without error.
* tapsets.cxx
(dwarf_var_expanding_visitor::visit_target_symbol_saved_return):
Attempt variable expansion immediately, and skip out on failure.
* testsuite/semok/thirtysix.stp: unblock the previously broken part.
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unresolvable $variables
* staptree.cxx (target_symbol::chain): New function.
* staptree.h: Declare it.
* (*): Use it instead of hand-chaining to target_symbol->saved_conversion_error.
* tapset-mark.cxx (*::visit_target_symbol): Chain resolution error object,
do not throw.
* tapset-procfs.cxx (*::visit_target_symbol): Ditto.
* tapset-utrace.cxx (*::visit_target_symbol): Ditto.
* tapsets.cxx (*::visit_target_symbol): Ditto.
(*::visit_defined_op): Explain & enforce the above.
* testsuite/semok/thirtysix.stp: Expand.
* testsuite/systemtap.base/sdt_misc.exp: Bonus fix: make work with blddir != srcdir.
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* staptree.h (defined_op): New class.
* all files: Extend all visitors as appropriate, mostly
dummy/pass-through implementation.
* parse.cxx (parse_target_symbol): New function, factored out
of parse_symbol().
(parse_define_op): New function.
* NEWS: Mention it.
* parse.h: Corresponding changes.
* tapsets.cxx (var_expanding_visitor::visit_defined_op):
Implement @defined() semantics.
(dwarf_var_expanding_visitor::visit_target_symbol): Adjust.
* tapset-utrace.c (visit_target_symbol_arg): Avoid crashes
on $argZZZ.
* tapsets.cxx (sdt_var_expanding_visitor): Ditto.
* semok/thirtysix.stp: New test.
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