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* elaborate.cxx: Revert builtin-function code.
* translate.cxx: Likewise.
* tapsets.{h,cxx}: Likewise.
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* elaborate.cxx
(semantic_pass_symbols): Only enter body if non-null.
(semantic_pass_types): Likewise.
(semantic_pass): Pass session to register_standard_tapsets.
* translate.cxx
(builtin_collector): New struct.
(hookup_builtins): New function.
(translate_pass): Only translate functions with bodies.
(c_unparser::emit_common_header): Likewise, and call hookup_builtins.
* tapsets.hh (builtin_function): New class.
(register_standard_tapsets): Change parameter to session.
* tapsets.cc (bultin_function::*): Implement class.
(register_standard_tapsets): Register printk, log, warn.
* testsuite/transok/six.stp: New test.
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* staptree.{h,cxx} (probe_alias): New structure.
* parse.{h,cxx} (parser::parse): Parse probes or probe aliases.
(parser::parse_probe): Likewise.
* tapsets.{h,cxx}:
(derived_probe_builder):
(match_key):
(match_node):
(alias_derived_probe): Move from here,
* elaborate.{h,cxx}: to here.
* elaborate.h (systemtap_session::pattern_root): New member.
(register_library_aliases): New function.
* tapsets.cxx: Build one dwarf_derived_probe per target address.
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* tapsets.h: New file.
(derived_probe_builder): Callback for making derived probes.
(match_key): Component of pattern-matching tree.
(match_node): Other component of pattern-matching tree.
* tapsets.cxx: Add pattern-matching system for probes.
(alias_derived_probe): Skeleton for alias probes.
(dwarf_derived_probe): Skeleton for dwarf probes.
(register_standard_tapsets): Registry for standard tapsets.
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